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NDQ_017398 | polar molecules tend to have lower boiling points than nonpolar molecules. | a. true, b. false | b | Lesson: hydrogen bonding
What Are Polar Compounds:
Polar compounds, such as water, are compounds that have a partial negative charge on one side of each molecule and a partial positive charge on the other side. All polar compounds contain polar bonds (although not all compounds that contain polar bonds are polar.) In ... |
NDQ_017399 | which of the following compounds has the highest melting point? | a. methane, b. ethylene, c. ammonia, d. water | d | Lesson: hydrogen bonding
What Are Polar Compounds:
Polar compounds, such as water, are compounds that have a partial negative charge on one side of each molecule and a partial positive charge on the other side. All polar compounds contain polar bonds (although not all compounds that contain polar bonds are polar.) In ... |
NDQ_017412 | an inclined plane is one of six types of simple machines. | a. true, b. false | a | Lesson: inclined plane
What Is An Inclined Plane:
An inclined plane is a simple machine that consists of a sloping surface connecting a lower elevation to a higher elevation. An inclined plane is one of six types of simple machines, and it is one of the oldest and most basic. In fact, two other simple machines, the we... |
NDQ_017413 | simple machines that are variations of the inclined plane include the | a. screw, b. lever, c. wedge, d. two of the above | d | Lesson: inclined plane
What Is An Inclined Plane:
An inclined plane is a simple machine that consists of a sloping surface connecting a lower elevation to a higher elevation. An inclined plane is one of six types of simple machines, and it is one of the oldest and most basic. In fact, two other simple machines, the we... |
NDQ_017414 | examples of inclined planes include | a. ramps, b. playground slides, c. ladders, d. all of the above | d | Lesson: inclined plane
What Is An Inclined Plane:
An inclined plane is a simple machine that consists of a sloping surface connecting a lower elevation to a higher elevation. An inclined plane is one of six types of simple machines, and it is one of the oldest and most basic. In fact, two other simple machines, the we... |
NDQ_017418 | mechanical advantage is the ratio of input force to output force. | a. true, b. false | b | Lesson: inclined plane
What Is An Inclined Plane:
An inclined plane is a simple machine that consists of a sloping surface connecting a lower elevation to a higher elevation. An inclined plane is one of six types of simple machines, and it is one of the oldest and most basic. In fact, two other simple machines, the we... |
NDQ_017419 | the mechanical advantage of an inclined plane is always | a. less than 1, b. equal to 1, c. greater than 1, d. equal to zero | c | Lesson: inclined plane
What Is An Inclined Plane:
An inclined plane is a simple machine that consists of a sloping surface connecting a lower elevation to a higher elevation. An inclined plane is one of six types of simple machines, and it is one of the oldest and most basic. In fact, two other simple machines, the we... |
NDQ_017420 | the more gradual the slope of an inclined plane, the greater its mechanical advantage is. | a. true, b. false | a | Lesson: inclined plane
What Is An Inclined Plane:
An inclined plane is a simple machine that consists of a sloping surface connecting a lower elevation to a higher elevation. An inclined plane is one of six types of simple machines, and it is one of the oldest and most basic. In fact, two other simple machines, the we... |
NDQ_017422 | only moving objects have inertia. | a. true, b. false | b | Lesson: inertia
What Is Inertia:
Inertia is the tendency of an object to resist a change in its motion. All objects have inertia, whether they are stationary or moving. Inertia explains Newtons first law of motion, which states that an object at rest will remain at rest and an object in motion will stay in motion unle... |
NDQ_017423 | newtons first law of motion is also called the law of inertia. | a. true, b. false | a | Lesson: inertia
What Is Inertia:
Inertia is the tendency of an object to resist a change in its motion. All objects have inertia, whether they are stationary or moving. Inertia explains Newtons first law of motion, which states that an object at rest will remain at rest and an object in motion will stay in motion unle... |
NDQ_017425 | which object has the greatest inertia? | a. 5-kg rock, b. 6-kg box of feathers, c. 7-kg bag of groceries, d. 8-kg bowling ball | d | Lesson: inertia
What Is Inertia:
Inertia is the tendency of an object to resist a change in its motion. All objects have inertia, whether they are stationary or moving. Inertia explains Newtons first law of motion, which states that an object at rest will remain at rest and an object in motion will stay in motion unle... |
NDQ_017427 | once an object starts moving, inertia keeps it moving without any additional force being applied to the object. | a. true, b. false | a | Lesson: inertia
What Is Inertia:
Inertia is the tendency of an object to resist a change in its motion. All objects have inertia, whether they are stationary or moving. Inertia explains Newtons first law of motion, which states that an object at rest will remain at rest and an object in motion will stay in motion unle... |
NDQ_017433 | intensity is a measure of a sound waves | a. speed, b. frequency, c. wavelength, d. energy | d | Lesson: intensity and loudness of sound
Its All About Energy:
Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).
D... |
NDQ_017435 | an 80-decibel sound is 20 times louder than a 60-decibel sound. | a. true, b. false | b | Lesson: intensity and loudness of sound
Its All About Energy:
Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).
D... |
NDQ_017437 | the intensity of sound depends on the | a. amplitude of the sound waves produced by the sound source, b. distance the sound waves have traveled from the sound source, c. speed at which the sound waves traveled from the sound source, d. two of the above | d | Lesson: intensity and loudness of sound
Its All About Energy:
Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).
D... |
NDQ_017438 | as distance from the sound source increases, the area covered by the sound waves decreases. | a. true, b. false | b | Lesson: intensity and loudness of sound
Its All About Energy:
Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).
D... |
NDQ_017439 | amplitude is a measure of the size of sound waves. | a. true, b. false | a | Lesson: intensity and loudness of sound
Its All About Energy:
Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).
D... |
NDQ_017440 | which sound is considered to be extremely loud? | a. dishwasher, b. lawn mower, c. vacuum cleaner, d. two of the above | b | Lesson: intensity and loudness of sound
Its All About Energy:
Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).
D... |
NDQ_017442 | all combustion engines | a. burn fuel to produce thermal energy, b. change thermal energy to kinetic energy, c. burn fuel inside the engine, d. two of the above | d | Lesson: internal combustion engines
Introducing Combustion Engines:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. In a car, the engine does the work of providing kinetic energy that turns the wheels. The combustion engine in a car is a type of e... |
NDQ_017443 | in an internal combustion engine, fuel is burned in the | a. cylinders, b. valves, c. spark plugs, d. pistons | a | Lesson: internal combustion engines
Introducing Combustion Engines:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. In a car, the engine does the work of providing kinetic energy that turns the wheels. The combustion engine in a car is a type of e... |
NDQ_017446 | a car engine provides the kinetic energy needed to | a. turn the wheels, b. apply the brakes, c. power the lights, d. two of the above | a | Lesson: internal combustion engines
Introducing Combustion Engines:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. In a car, the engine does the work of providing kinetic energy that turns the wheels. The combustion engine in a car is a type of e... |
NDQ_017449 | all cars have at least eight cylinders. | a. true, b. false | b | Lesson: internal combustion engines
Introducing Combustion Engines:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. In a car, the engine does the work of providing kinetic energy that turns the wheels. The combustion engine in a car is a type of e... |
NDQ_017450 | the more pistons a car has, the greater the cars power is. | a. true, b. false | a | Lesson: internal combustion engines
Introducing Combustion Engines:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. In a car, the engine does the work of providing kinetic energy that turns the wheels. The combustion engine in a car is a type of e... |
NDQ_017455 | what is the basic unit of mass in the international system of units? | a. ounce, b. pound, c. gram, d. kilogram | c | Lesson: international system of units
SI Units:
The example of the Mars Climate Orbiter shows the importance of using a standard system of measurement in science and technology. The measurement system used by most scientists and engineers is the International System of Units, or SI. There are a total of seven basic SI... |
NDQ_017456 | the prefix that multiplies a basic si unit by 0.01 is | a. kilo-, b. deci-, c. centi-, d. milli- | c | Lesson: international system of units
SI Units:
The example of the Mars Climate Orbiter shows the importance of using a standard system of measurement in science and technology. The measurement system used by most scientists and engineers is the International System of Units, or SI. There are a total of seven basic SI... |
NDQ_017459 | a kilogram equals one-thousandth of a gram. | a. true, b. false | b | Lesson: international system of units
SI Units:
The example of the Mars Climate Orbiter shows the importance of using a standard system of measurement in science and technology. The measurement system used by most scientists and engineers is the International System of Units, or SI. There are a total of seven basic SI... |
NDQ_017463 | how do ionic bonds form? | a. atoms of metallic elements give up electrons to atoms of nonmetallic elements, b. atoms of nonmetallic elements give up electrons to atoms of metallic elements, c. atoms of metallic elements accept electrons from atoms of nonmetallic elements, d. two of the above | a | Lesson: ionic bonding
How Ionic Bonds Form:
An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. The Figure 1.1 shows how this happens. In row 1 of the Figure 1.1, an atom of sodium (Na) d... |
NDQ_017464 | in an ionic bond, the metallic ion is always a positive ion. | a. true, b. false | a | Lesson: ionic bonding
How Ionic Bonds Form:
An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. The Figure 1.1 shows how this happens. In row 1 of the Figure 1.1, an atom of sodium (Na) d... |
NDQ_017465 | positive ions are named by adding the suffix ide to the first part of the element name. | a. true, b. false | b | Lesson: ionic bonding
How Ionic Bonds Form:
An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. The Figure 1.1 shows how this happens. In row 1 of the Figure 1.1, an atom of sodium (Na) d... |
NDQ_017467 | ionic bonds form only between metals and nonmetals. | a. true, b. false | a | Lesson: ionic bonding
How Ionic Bonds Form:
An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. The Figure 1.1 shows how this happens. In row 1 of the Figure 1.1, an atom of sodium (Na) d... |
NDQ_017468 | atoms of the element sodium want to give up an electron because sodium atoms | a. already have seven valence electrons, b. do not need any electrons, c. have just one valence electron, d. form negative metal ions | c | Lesson: ionic bonding
How Ionic Bonds Form:
An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. The Figure 1.1 shows how this happens. In row 1 of the Figure 1.1, an atom of sodium (Na) d... |
NDQ_017469 | metals in group 2 of the periodic table form ionic bonds with nonmetals in group | a. 15, b. 16, c. 17, d. 18 | b | Lesson: ionic bonding
How Ionic Bonds Form:
An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. The Figure 1.1 shows how this happens. In row 1 of the Figure 1.1, an atom of sodium (Na) d... |
NDQ_017473 | ionic compounds form when ions of two different elements share electrons. | a. true, b. false | b | Lesson: ionic compounds
What Are Ionic Compounds:
All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds. In this type of compound, electrons actually move between the atoms, rather than being sha... |
NDQ_017474 | an ionic compound is always neutral in charge. | a. true, b. false | a | Lesson: ionic compounds
What Are Ionic Compounds:
All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds. In this type of compound, electrons actually move between the atoms, rather than being sha... |
NDQ_017476 | how are ionic compounds named? | a. the positive ion comes first in the compound name, b. the negative ion comes first in the compound name, c. the ion in the higher-numbered period comes first in the compound name, d. two of the above | a | Lesson: ionic compounds
What Are Ionic Compounds:
All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds. In this type of compound, electrons actually move between the atoms, rather than being sha... |
NDQ_017478 | properties of ionic compounds include | a. high melting point, b. ability to conduct electricity, c. brittleness, d. two of the above | d | Lesson: ionic compounds
What Are Ionic Compounds:
All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds. In this type of compound, electrons actually move between the atoms, rather than being sha... |
NDQ_017480 | uses of ionic compounds include | a. making fireworks, b. detecting moisture, c. melting ice, d. all of the above | d | Lesson: ionic compounds
What Are Ionic Compounds:
All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds. In this type of compound, electrons actually move between the atoms, rather than being sha... |
NDQ_017484 | an iodine atom has 53 protons. how many electrons does an iodine anion have? | a. at least 54, b. 53 or more, c. 53 or less, d. none of the above | a | Lesson: ions
Atoms Are Neutral:
The northern lights arent caused by atoms, because atoms are not charged particles. An atom always has the same number of electrons as protons. Electrons have an electric charge of -1 and protons have an electric charge of +1. Therefore, the charges of an atoms electrons and protons can... |
NDQ_017485 | what is the name of the ion represented by the following symbol? o2- | a. oxygen ion, b. dioxide, c. oxide, d. none of the above | c | Lesson: ions
Atoms Are Neutral:
The northern lights arent caused by atoms, because atoms are not charged particles. An atom always has the same number of electrons as protons. Electrons have an electric charge of -1 and protons have an electric charge of +1. Therefore, the charges of an atoms electrons and protons can... |
NDQ_017486 | the process in which ions form is called ionization. | a. true, b. false | a | Lesson: ions
Atoms Are Neutral:
The northern lights arent caused by atoms, because atoms are not charged particles. An atom always has the same number of electrons as protons. Electrons have an electric charge of -1 and protons have an electric charge of +1. Therefore, the charges of an atoms electrons and protons can... |
NDQ_017487 | ways in which ions may form include | a. exposure to radiation, b. transfer of electrons between atoms, c. sharing of electrons between atoms, d. two of the above | d | Lesson: ions
Atoms Are Neutral:
The northern lights arent caused by atoms, because atoms are not charged particles. An atom always has the same number of electrons as protons. Electrons have an electric charge of -1 and protons have an electric charge of +1. Therefore, the charges of an atoms electrons and protons can... |
NDQ_017488 | ions are very unreactive. | a. true, b. false | b | Lesson: ions
Atoms Are Neutral:
The northern lights arent caused by atoms, because atoms are not charged particles. An atom always has the same number of electrons as protons. Electrons have an electric charge of -1 and protons have an electric charge of +1. Therefore, the charges of an atoms electrons and protons can... |
NDQ_017489 | ions are deflected by a magnetic field. | a. true, b. false | a | Lesson: ions
Atoms Are Neutral:
The northern lights arent caused by atoms, because atoms are not charged particles. An atom always has the same number of electrons as protons. Electrons have an electric charge of -1 and protons have an electric charge of +1. Therefore, the charges of an atoms electrons and protons can... |
NDQ_017492 | only unsaturated hydrocarbons have isomers. | a. true, b. false | b | Lesson: isomers
Same Atoms Different Shapes:
Hydrocarbons are compounds that contain only carbon and hydrogen atoms. The smallest hydrocarbon, methane (CH4 ), contains just one carbon atom and four hydrogen atoms. Larger hydrocarbons contain many more. Hydro- carbons with four or more carbon atoms can have different s... |
NDQ_017493 | which statement about the isomers of a given hydrocarbon is true? | a. they have the same chemical formula, b. they have the same structural formula, c. they have the same number of carbon atoms, d. two of the above | d | Lesson: isomers
Same Atoms Different Shapes:
Hydrocarbons are compounds that contain only carbon and hydrogen atoms. The smallest hydrocarbon, methane (CH4 ), contains just one carbon atom and four hydrogen atoms. Larger hydrocarbons contain many more. Hydro- carbons with four or more carbon atoms can have different s... |
NDQ_017496 | how many isomers does pentane have? | a. 1, b. 2, c. 3, d. 4 | c | Lesson: isomers
Same Atoms Different Shapes:
Hydrocarbons are compounds that contain only carbon and hydrogen atoms. The smallest hydrocarbon, methane (CH4 ), contains just one carbon atom and four hydrogen atoms. Larger hydrocarbons contain many more. Hydro- carbons with four or more carbon atoms can have different s... |
NDQ_017497 | some hydrocarbons have billions of isomers. | a. true, b. false | a | Lesson: isomers
Same Atoms Different Shapes:
Hydrocarbons are compounds that contain only carbon and hydrogen atoms. The smallest hydrocarbon, methane (CH4 ), contains just one carbon atom and four hydrogen atoms. Larger hydrocarbons contain many more. Hydro- carbons with four or more carbon atoms can have different s... |
NDQ_017500 | the more branching an isomer has, the lower its melting point is. | a. true, b. false | a | Lesson: isomers
Same Atoms Different Shapes:
Hydrocarbons are compounds that contain only carbon and hydrogen atoms. The smallest hydrocarbon, methane (CH4 ), contains just one carbon atom and four hydrogen atoms. Larger hydrocarbons contain many more. Hydro- carbons with four or more carbon atoms can have different s... |
NDQ_017502 | all isotopes form naturally. | a. true, b. false | b | Lesson: isotopes
What Are Isotopes:
All atoms of the same element have the same number of protons, but some may have different numbers of neutrons. For example, all carbon atoms have six protons, and most have six neutrons as well. But some carbon atoms have seven or eight neutrons instead of the usual six. Atoms of t... |
NDQ_017503 | all isotopes are radioactive. | a. true, b. false | b | Lesson: isotopes
What Are Isotopes:
All atoms of the same element have the same number of protons, but some may have different numbers of neutrons. For example, all carbon atoms have six protons, and most have six neutrons as well. But some carbon atoms have seven or eight neutrons instead of the usual six. Atoms of t... |
NDQ_017506 | deuterium is an isotope of | a. oxygen, b. helium, c. carbon, d. hydrogen | d | Lesson: isotopes
What Are Isotopes:
All atoms of the same element have the same number of protons, but some may have different numbers of neutrons. For example, all carbon atoms have six protons, and most have six neutrons as well. But some carbon atoms have seven or eight neutrons instead of the usual six. Atoms of t... |
NDQ_017507 | how many neutrons does the isotope in question 6 have? | a. one, b. two, c. three, d. four | a | Lesson: isotopes
What Are Isotopes:
All atoms of the same element have the same number of protons, but some may have different numbers of neutrons. For example, all carbon atoms have six protons, and most have six neutrons as well. But some carbon atoms have seven or eight neutrons instead of the usual six. Atoms of t... |
NDQ_017512 | things with kinetic energy can do work. | a. true, b. false | a | Lesson: kinetic energy
Defining Kinetic Energy:
Kinetic energy is the energy of moving matter. Anything that is moving has kinetic energyfrom atoms in matter to stars in outer space. Things with kinetic energy can do work. For example, the spinning saw blade in the photo above is doing the work of cutting through a pi... |
NDQ_017516 | an objects mass has a greater influence on its kinetic energy than does its velocity. | a. true, b. false | b | Lesson: kinetic energy
Defining Kinetic Energy:
Kinetic energy is the energy of moving matter. Anything that is moving has kinetic energyfrom atoms in matter to stars in outer space. Things with kinetic energy can do work. For example, the spinning saw blade in the photo above is doing the work of cutting through a pi... |
NDQ_017517 | how much kinetic energy does a 50-kg object have if it is moving at a velocity of 2 m/s? | a. 200 j, b. 100 j, c. 50 j, d. none of the above | b | Lesson: kinetic energy
Defining Kinetic Energy:
Kinetic energy is the energy of moving matter. Anything that is moving has kinetic energyfrom atoms in matter to stars in outer space. Things with kinetic energy can do work. For example, the spinning saw blade in the photo above is doing the work of cutting through a pi... |
NDQ_017518 | if the object in question 6 slows down to a velocity of 1 m/s, how much kinetic energy does it have? | a. 100 j, b. 50 j, c. 25 j, d. none of the above | c | Lesson: kinetic energy
Defining Kinetic Energy:
Kinetic energy is the energy of moving matter. Anything that is moving has kinetic energyfrom atoms in matter to stars in outer space. Things with kinetic energy can do work. For example, the spinning saw blade in the photo above is doing the work of cutting through a pi... |
NDQ_017520 | energy can be measured in the si unit n m. | a. true, b. false | a | Lesson: kinetic energy
Defining Kinetic Energy:
Kinetic energy is the energy of moving matter. Anything that is moving has kinetic energyfrom atoms in matter to stars in outer space. Things with kinetic energy can do work. For example, the spinning saw blade in the photo above is doing the work of cutting through a pi... |
NDQ_017524 | if particles of matter do not have enough kinetic energy to slide past one another, then the matter exists as a | a. gas, b. solid, c. liquid, d. plasma | b | Lesson: kinetic theory of matter
Moving Matter:
Energy is the ability to cause changes in matter. For example, your body uses chemical energy when you lift your arm or take a step. In both cases, energy is used to move matteryou. Any matter that is moving has energy just because its moving. The energy of moving matter... |
NDQ_017525 | the particles of solids do not have enough energy to move. | a. true, b. false | b | Lesson: kinetic theory of matter
Moving Matter:
Energy is the ability to cause changes in matter. For example, your body uses chemical energy when you lift your arm or take a step. In both cases, energy is used to move matteryou. Any matter that is moving has energy just because its moving. The energy of moving matter... |
NDQ_017526 | as the kinetic energy of particles of matter increases, the distance between the particles | a. vibrates, b. increases, c. decreases, d. remains constant | b | Lesson: kinetic theory of matter
Moving Matter:
Energy is the ability to cause changes in matter. For example, your body uses chemical energy when you lift your arm or take a step. In both cases, energy is used to move matteryou. Any matter that is moving has energy just because its moving. The energy of moving matter... |
NDQ_017528 | scientists think that the particles of all matter are in constant motion. | a. true, b. false | a | Lesson: kinetic theory of matter
Moving Matter:
Energy is the ability to cause changes in matter. For example, your body uses chemical energy when you lift your arm or take a step. In both cases, energy is used to move matteryou. Any matter that is moving has energy just because its moving. The energy of moving matter... |
NDQ_017530 | particles of liquids have enough energy to separate from other liquid particles. | a. true, b. false | b | Lesson: kinetic theory of matter
Moving Matter:
Energy is the ability to cause changes in matter. For example, your body uses chemical energy when you lift your arm or take a step. In both cases, energy is used to move matteryou. Any matter that is moving has energy just because its moving. The energy of moving matter... |
NDQ_017533 | whenever an action and reaction occur, momentum is | a. created, b. destroyed, c. transferred, d. none of the above | c | Lesson: law of conservation of momentum
Conserving Momentum:
When skater 2 runs into skater 1, hes going faster than skater 1 so he has more momentum. Momentum is a property of a moving object that makes it hard to stop. Its a product of the objects mass and velocity. At the moment of the collision, skater 2 transfers... |
NDQ_017534 | when momentum is transferred from one object to another, their combined momentum remains the same. | a. true, b. false | a | Lesson: law of conservation of momentum
Conserving Momentum:
When skater 2 runs into skater 1, hes going faster than skater 1 so he has more momentum. Momentum is a property of a moving object that makes it hard to stop. Its a product of the objects mass and velocity. At the moment of the collision, skater 2 transfers... |
NDQ_017543 | when light reflects off a smooth surface, it forms a clear image. | a. true, b. false | a | Lesson: law of reflection
Reflected Light and Images:
Reflection is one of several ways that light can interact with matter. Light reflects off surfaces such as mirrors that do not transmit or absorb light. When light is reflected from a smooth surface, it may form an image. An image is a copy of an object that is for... |
NDQ_017544 | the type of reflection described in question 3 is called | a. normal reflection, b. diffuse reflection, c. regular reflection, d. none of the above | c | Lesson: law of reflection
Reflected Light and Images:
Reflection is one of several ways that light can interact with matter. Light reflects off surfaces such as mirrors that do not transmit or absorb light. When light is reflected from a smooth surface, it may form an image. An image is a copy of an object that is for... |
NDQ_017545 | rays of light are reflected in many different directions in | a. specular reflection, b. regular reflection, c. diffuse reflection, d. all of the above | c | Lesson: law of reflection
Reflected Light and Images:
Reflection is one of several ways that light can interact with matter. Light reflects off surfaces such as mirrors that do not transmit or absorb light. When light is reflected from a smooth surface, it may form an image. An image is a copy of an object that is for... |
NDQ_017546 | the image formed when light rays are reflected as described in question 5 is blurry or fuzzy. | a. true, b. false | a | Lesson: law of reflection
Reflected Light and Images:
Reflection is one of several ways that light can interact with matter. Light reflects off surfaces such as mirrors that do not transmit or absorb light. When light is reflected from a smooth surface, it may form an image. An image is a copy of an object that is for... |
NDQ_017550 | the angles of reflection and incidence are measured relative to a line that is parallel to the reflective surface. | a. true, b. false | b | Lesson: law of reflection
Reflected Light and Images:
Reflection is one of several ways that light can interact with matter. Light reflects off surfaces such as mirrors that do not transmit or absorb light. When light is reflected from a smooth surface, it may form an image. An image is a copy of an object that is for... |
NDQ_017552 | a lens reflects light and forms an image. | a. true, b. false | b | Lesson: lens
What Is a Lens:
A lens is a transparent object with one or two curved surfaces. It is typically made of glass (or clear plastic in the case of a contact lens). A lens refracts, or bends, light and forms an image. An image is a copy of an objected formed by the refraction (or reflection) of visible light. ... |
NDQ_017553 | the less curved the surface of a lens is, the more the lens refracts light. | a. true, b. false | b | Lesson: lens
What Is a Lens:
A lens is a transparent object with one or two curved surfaces. It is typically made of glass (or clear plastic in the case of a contact lens). A lens refracts, or bends, light and forms an image. An image is a copy of an objected formed by the refraction (or reflection) of visible light. ... |
NDQ_017556 | the image of an object formed by a concave lens is always | a. on the same side of the lens as the object, b. smaller than the object, c. right-side up, d. all of the above | d | Lesson: lens
What Is a Lens:
A lens is a transparent object with one or two curved surfaces. It is typically made of glass (or clear plastic in the case of a contact lens). A lens refracts, or bends, light and forms an image. An image is a copy of an objected formed by the refraction (or reflection) of visible light. ... |
NDQ_017557 | a concave lens forms only real images. | a. true, b. false | b | Lesson: lens
What Is a Lens:
A lens is a transparent object with one or two curved surfaces. It is typically made of glass (or clear plastic in the case of a contact lens). A lens refracts, or bends, light and forms an image. An image is a copy of an objected formed by the refraction (or reflection) of visible light. ... |
NDQ_017558 | a convex lens forms a virtual image when the object is | a. closer to the lens than the focus is, b. farther from the lens than the focus is, c. the same distance from the lens as the focus is, d. on the opposite side of the lens from the focus | a | Lesson: lens
What Is a Lens:
A lens is a transparent object with one or two curved surfaces. It is typically made of glass (or clear plastic in the case of a contact lens). A lens refracts, or bends, light and forms an image. An image is a copy of an objected formed by the refraction (or reflection) of visible light. ... |
NDQ_017564 | levers that change the direction of the force are | a. first class levers, b. second class levers, c. third class levers, d. all of the above | a | Lesson: lever
What Is A Lever:
A lever is a simple machine consisting of a bar that rotates around a fixed point. The fixed point of a lever is called the fulcrum. Like other machines, a lever makes work easier by changing the force applied to the machine or the distance over which the force is applied. How does a ham... |
NDQ_017567 | examples of first-class levers include | a. see saws, b. wheelbarrows, c. rakes, d. two of the above | a | Lesson: lever
What Is A Lever:
A lever is a simple machine consisting of a bar that rotates around a fixed point. The fixed point of a lever is called the fulcrum. Like other machines, a lever makes work easier by changing the force applied to the machine or the distance over which the force is applied. How does a ham... |
NDQ_017568 | all of the following are third-class levers except | a. brooms, b. hockey sticks, c. rakes, d. wheelbarrows | d | Lesson: lever
What Is A Lever:
A lever is a simple machine consisting of a bar that rotates around a fixed point. The fixed point of a lever is called the fulcrum. Like other machines, a lever makes work easier by changing the force applied to the machine or the distance over which the force is applied. How does a ham... |
NDQ_017569 | a second class lever always has an ideal mechanical advantage less than 1. | a. true, b. false | b | Lesson: lever
What Is A Lever:
A lever is a simple machine consisting of a bar that rotates around a fixed point. The fixed point of a lever is called the fulcrum. Like other machines, a lever makes work easier by changing the force applied to the machine or the distance over which the force is applied. How does a ham... |
NDQ_017570 | a third class lever always applies the output force over a greater distance than the input force. | a. true, b. false | a | Lesson: lever
What Is A Lever:
A lever is a simple machine consisting of a bar that rotates around a fixed point. The fixed point of a lever is called the fulcrum. Like other machines, a lever makes work easier by changing the force applied to the machine or the distance over which the force is applied. How does a ham... |
NDQ_017573 | sunlight carries the complete range of wavelengths of electromagnetic waves. | a. true, b. false | a | Lesson: light
The Waves in Sunlight:
Electromagnetic waves are waves that carry energy through matter or space as vibrating electric and magnetic fields. Electromagnetic waves have a wide range of wavelengths and frequencies. Sunlight contains the complete range of wavelengths of electromagnetic waves, which is called... |
NDQ_017574 | light includes | a. visible light, b. ultraviolet light, c. infrared light, d. all of the above | d | Lesson: light
The Waves in Sunlight:
Electromagnetic waves are waves that carry energy through matter or space as vibrating electric and magnetic fields. Electromagnetic waves have a wide range of wavelengths and frequencies. Sunlight contains the complete range of wavelengths of electromagnetic waves, which is called... |
NDQ_017577 | sources of infrared light include | a. the sun, b. flames, c. living things, d. all of the above | d | Lesson: light
The Waves in Sunlight:
Electromagnetic waves are waves that carry energy through matter or space as vibrating electric and magnetic fields. Electromagnetic waves have a wide range of wavelengths and frequencies. Sunlight contains the complete range of wavelengths of electromagnetic waves, which is called... |
NDQ_017578 | visible light with the highest frequencies appears to our eyes as the color | a. red, b. yellow, c. green, d. violet | d | Lesson: light
The Waves in Sunlight:
Electromagnetic waves are waves that carry energy through matter or space as vibrating electric and magnetic fields. Electromagnetic waves have a wide range of wavelengths and frequencies. Sunlight contains the complete range of wavelengths of electromagnetic waves, which is called... |
NDQ_017579 | ultraviolet light can be used to kill bacteria in food. | a. true, b. false | a | Lesson: light
The Waves in Sunlight:
Electromagnetic waves are waves that carry energy through matter or space as vibrating electric and magnetic fields. Electromagnetic waves have a wide range of wavelengths and frequencies. Sunlight contains the complete range of wavelengths of electromagnetic waves, which is called... |
NDQ_017581 | lipids are biochemical compounds that include fats and oils. | a. true, b. false | a | Lesson: lipid classification
What Are Lipids:
Lipids are one of four classes of biochemical compounds, which are compounds that make up living things and carry out life processes. (The other three classes of biochemical compounds are carbohydrates, proteins, and nucleic acids.) Living things use lipids to store energy... |
NDQ_017585 | all lipids contain | a. oxygen, b. nitrogen, c. phosphorus, d. two of the above | a | Lesson: lipid classification
What Are Lipids:
Lipids are one of four classes of biochemical compounds, which are compounds that make up living things and carry out life processes. (The other three classes of biochemical compounds are carbohydrates, proteins, and nucleic acids.) Living things use lipids to store energy... |
NDQ_017587 | lipids known as fats consist of saturated fatty acids. | a. true, b. false | a | Lesson: lipid classification
What Are Lipids:
Lipids are one of four classes of biochemical compounds, which are compounds that make up living things and carry out life processes. (The other three classes of biochemical compounds are carbohydrates, proteins, and nucleic acids.) Living things use lipids to store energy... |
NDQ_017588 | unsaturated fatty acids contain only single bonds between carbon atoms. | a. true, b. false | b | Lesson: lipid classification
What Are Lipids:
Lipids are one of four classes of biochemical compounds, which are compounds that make up living things and carry out life processes. (The other three classes of biochemical compounds are carbohydrates, proteins, and nucleic acids.) Living things use lipids to store energy... |
NDQ_017603 | a longitudinal wave is a type of mechanical wave. | a. true, b. false | a | Lesson: longitudinal wave
What Is a Longitudinal Wave:
A longitudinal wave is a type of mechanical wave. A mechanical wave is a wave that travels through matter, called the medium. In a longitudinal wave, particles of the medium vibrate in a direction that is parallel to the direction that the wave travels. You can se... |
NDQ_017606 | in a longitudinal wave, particles of the medium vibrate in a direction that is perpendicular to the direction the wave travels. | a. true, b. false | b | Lesson: longitudinal wave
What Is a Longitudinal Wave:
A longitudinal wave is a type of mechanical wave. A mechanical wave is a wave that travels through matter, called the medium. In a longitudinal wave, particles of the medium vibrate in a direction that is parallel to the direction that the wave travels. You can se... |
NDQ_017608 | earthquakes cause longitudinal waves called p waves. | a. true, b. false | a | Lesson: longitudinal wave
What Is a Longitudinal Wave:
A longitudinal wave is a type of mechanical wave. A mechanical wave is a wave that travels through matter, called the medium. In a longitudinal wave, particles of the medium vibrate in a direction that is parallel to the direction that the wave travels. You can se... |
NDQ_017609 | a longitudinal wave that carries more energy has particles that are | a. closer together in rarefactions, b. father apart in compressions, c. the same distance apart everywhere, d. none of the above | d | Lesson: longitudinal wave
What Is a Longitudinal Wave:
A longitudinal wave is a type of mechanical wave. A mechanical wave is a wave that travels through matter, called the medium. In a longitudinal wave, particles of the medium vibrate in a direction that is parallel to the direction that the wave travels. You can se... |
NDQ_017611 | earths magnetic poles have switched places repeatedly in the past. | a. true, b. false | a | Lesson: magnetic field reversal
Changing Places:
Earths magnetic poles have switched places repeatedly in the past. As you can see in the Figure 1.1, each time the switch occurred, Earths magnetic field was reversed. The magnetic field is the region around a magnet over which it exerts magnetic force. We think of toda... |
NDQ_017615 | scientists know for certain why magnetic field reversals occur. | a. true, b. false | b | Lesson: magnetic field reversal
Changing Places:
Earths magnetic poles have switched places repeatedly in the past. As you can see in the Figure 1.1, each time the switch occurred, Earths magnetic field was reversed. The magnetic field is the region around a magnet over which it exerts magnetic force. We think of toda... |
NDQ_017616 | evidence for magnetic field reversals | a. covers 100s of millions of years, b. was discovered on the ocean floor, c. comes from the magnetic domains of rocks, d. all of the above | d | Lesson: magnetic field reversal
Changing Places:
Earths magnetic poles have switched places repeatedly in the past. As you can see in the Figure 1.1, each time the switch occurred, Earths magnetic field was reversed. The magnetic field is the region around a magnet over which it exerts magnetic force. We think of toda... |
NDQ_017617 | when did the last magnetic reversal occur? | a. more than 330 million years ago, b. about 300 million years ago, c. about 100 million years ago, d. less than 1 million years ago | d | Lesson: magnetic field reversal
Changing Places:
Earths magnetic poles have switched places repeatedly in the past. As you can see in the Figure 1.1, each time the switch occurred, Earths magnetic field was reversed. The magnetic field is the region around a magnet over which it exerts magnetic force. We think of toda... |
NDQ_017618 | rocks on the ocean floor far from a ridge | a. are older than rocks close to the ridge, b. always have reversed polarity, c. keep reversing the polarity of their magnetic domains, d. two of the above | a | Lesson: magnetic field reversal
Changing Places:
Earths magnetic poles have switched places repeatedly in the past. As you can see in the Figure 1.1, each time the switch occurred, Earths magnetic field was reversed. The magnetic field is the region around a magnet over which it exerts magnetic force. We think of toda... |
NDQ_017619 | after magma hardens, the alignment of magnetic domains reverses with each magnetic field reversal. | a. true, b. false | b | Lesson: magnetic field reversal
Changing Places:
Earths magnetic poles have switched places repeatedly in the past. As you can see in the Figure 1.1, each time the switch occurred, Earths magnetic field was reversed. The magnetic field is the region around a magnet over which it exerts magnetic force. We think of toda... |
NDQ_017622 | only bar magnets have north and south magnetic poles. | a. true, b. false | b | Lesson: magnets
Magnetic Poles:
A magnet is an object that attracts certain materials such as iron. Youre probably familiar with common bar magnets, like the one shown in the Figure 1.1. Like all magnets, this bar magnet has north and south magnetic poles. The red end of the magnet is the north pole and the blue end i... |
NDQ_017625 | if you cut a bar magnet in half, one half will have just a north pole and the other half will have just a south pole. | a. true, b. false | b | Lesson: magnets
Magnetic Poles:
A magnet is an object that attracts certain materials such as iron. Youre probably familiar with common bar magnets, like the one shown in the Figure 1.1. Like all magnets, this bar magnet has north and south magnetic poles. The red end of the magnet is the north pole and the blue end i... |
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