text stringlengths 790 2.88k |
|---|
of the constructive and destructive interference of the fundamental wave with all the existing overtones that occur in the string. For example, Figure 8.37 shows the wave trace on an oscilloscope for the sound of a violin. Figure 8.37 The interference of the fundamental frequency with the overtones produced by a bowed... |
inet or oboe, for example, the effective length of the pipe is changed by covering or uncovering holes at various lengths down the side of the pipe. The strongest or most resonant frequency will be the wave whose length is twice the distance from the mouthpiece to the first open hole. Overtones are also generated but t... |
in-phase point sources in a ripple tank. The distance between the sources is 3. Individually, point sources generate waves that are sets of expanding concentric circles. As the crests and troughs from each source move outward, they cross through each other. As with all waves, when the crests from one source overlap cr... |
Figure 8.44 The interference pattern for two in-phase point sources results from the overlap of two sets of concentric circles. In this diagram, the centres of the circles are three wavelengths apart. Maxima, Minima, and Phase Shifts The central maximum is a line of antinodes. In Figure 8.44, the line P1P2 is the perp... |
point interference systems, follow the links at www.pearsoned.ca/school/ physicssource. A first order maximum is the result of a one wavelength phase shift. Moving farther right, another region of constructive interference occurs. To arrive at any point on R1R2, crests from S1 travel exactly one wavelength farther than... |
for sound. Design a set-up that will enable you to measure the wavelength of sound of known frequencies. If electronic equipment (probeware or waveport) is available, design lab 8-8 to incorporate this equipment. Measure the wavelengths using several maxima and minima to compare measurements. Which type of line gives ... |
, 2 cm, 3 cm,..., until you reach the edge of the paper. On the diagram, draw solid lines along maxima and dotted lines along minima. Label the maxima according to their order. Explain why there are five minima on either side of the central maximum. 9. An interference pattern from two in-phase point sources is generate... |
the wavelength of the sound is 3.50 m. v fλ λ v f 350 m s 0 10 s 3.50 m vw 350 m/s λ 3.50 m Figure 8.46 When a wavelength of 3.50 m travels toward you at a speed of 350 m/s, you hear sound that has a frequency of 100 Hz (diagram not to scale). You hear the sound at a frequency of 100 Hz because at a speed of 350 m/s, ... |
8 m If waves that are 2.8 m long travel toward you at a speed of 350 m/s, then the frequency of the sound arriving at your ear will be 125 Hz. The pitch of the sound that you hear will have been increased because the source is moving toward you. v fλ v f λ 350 m s 2.80 m 125 1 s 125 Hz At the same time, along a line in... |
wavelength (λ d) produces the Doppler frequency (fd) of the sound that you hear as the source approaches you. Therefore, v w λ d fd vw vs vw f s f s vw fs vw vs v w vw vs is the Doppler frequency when the source is approaching the listener. Sources Moving Away from You If the source is moving away from the listener, t... |
/s. 3. An automobile is travelling toward you at a speed of 25.0 m/s. When you measure the frequency of its horn, you obtain a value of 260 Hz. If the actual frequency of the horn is known to be 240 Hz, calculate vw, the speed of sound in air. 4. As a train moves away from you, the frequency of its whistle is determine... |
boat moving through water produces a bow wave. The crest of the wave moves sideways away from the object, producing the wave’s characteristic V-shape. For an airplane moving through the fluid medium of the atmosphere, a V-shaped bow wave, or pressure wave, travels outward at the speed of sound (Figure 8.48). If the sp... |
speed of sound, then vs means that for any sound produced by the jet, the Doppler wavelength in the direction of the jet’s motion is zero. Even if the plane’s speed is greater than that of sound, the bow waves still combine to form a shock wave. In this way a sonic boom can be heard for any object, such as a rifle bul... |
.2) (a) What affects the speed of a water wave? (b) What is the nature of the motion of the medium when a longitudinal wave moves through it? (c) Describe how the speed of a wave affects its wavelength and its amplitude. (d) Explain why waves are considered a form of Simple Harmonic Motion. (e) If speed is constant, ho... |
. In half of the tank, a glass plate is placed on the bottom to make the water in that half shallower. The glass plate is 0.5 cm thick. Thus, the tank has a deep section (0.7 cm) and a shallow section (0.2 cm). In the deep section the wave velocity is 15.0 cm/s while in the shallow section the velocity is 10.0 cm/s. St... |
.5 Hz generates a standing wave in a spring that has three antinodes, (a) what frequency generates a standing wave with five antinodes in the same spring, and (b) what is the fundamental frequency for this spring? 13. A violin string is 33.0 cm long. The thinnest string on the violin is tuned to vibrate at a frequency ... |
h, what is the apparent frequency of the sound? 18. How fast is a sound source moving toward you if you hear the frequency to be 580 Hz when the true frequency is 540 Hz? The speed of sound in air is 350 m/s. Express your answer in km/h. 19. If the speed of sound in air is 350 m/s, how fast would a sound source need to... |
investigate. Questions you will need to consider are: How will you present the information to your audience? What are the resources at your disposal? Do you have access to computers and presentation programs such as PowerPoint®? Which team members will design, build, and demonstrate the model seismograph? Brainstorm s... |
of conditions. 7.1 Period and Frequency Period is the time for one complete cycle, measured in seconds (s). If the period of each cycle remains constant, the object is moving with oscillatory motion. Frequency is the number of cycles per second, measured in Hertz (Hz). 7.2 Simple Harmonic Motion The spring constant is... |
Figures 7.39, 7.40; eSIM; Example 7.8 7.4 Applications of Simple Harmonic Motion Resonance is the natural frequency of vibration of an object. Figure 7.41; QuickLab 7-5 Forced frequency is the frequency at which an external force is applied to an oscillating object. Figure 7.41; QuickLab 7-5 Bridges and buildings can ... |
constructive interference crest destructive interference diverging Doppler effect equilibrium forced frequency frequency fundamental frequency Hooke’s law incident wave in phase interference longitudinal wave maximum mechanical resonance medium minimum nodes or nodal points open-pipe air column oscillation oscillatory... |
the direction of a wave train. 13. Points of zero displacement on a transverse wave have the greatest kinetic energy. Which points on a longitudinal wave have the greatest kinetic energy? 14. How is the shape of a circular wave front changed when it reflects from a straight barrier? 15. What aspect of a pulse determin... |
a frequency of 400.0 Hz and a spring constant of 5.0 104 N/m. What is the mass of the string? 30. When a pendulum is displaced 90.0° from the vertical, what proportion of the force of gravity is the restoring force? 31. While performing a demonstration to determine the spring constant of an elastic band, a student pul... |
simple harmonic motion. The amplitude of motion is 0.80 m and its speed is 1.5 m/s in the equilibrium position. What is the speed of the branch at the displacement of 0.60 m? 38. A tuned mass damper at the top of a skyscraper is a mass suspended from a thick cable. If the building sways with a frequency of 0.125 Hz, w... |
nodes and antinodes would there be along the spring? (b) What is the next lower frequency for which a standing wave pattern could exist in this spring? 47. The second string on a violin is tuned to the note D with a frequency of 293 Hz. This is the fundamental frequency for the open string, which is 33.0 cm long. (a) ... |
are 3.5 wavelengths apart. Near the middle of the page, place two points (S1 and S2) 3.5 cm apart to represent the positions of the sources. Draw wavelengths 1.0 cm long by drawing concentric circles that increase in radii by 1.0-cm increments. Locate on the diagram all the maxima and minima that are generated by this... |
frequency. What type of relationship is this? 57. Outline an experimental procedure that you could perform to determine the spring constant of a vertical mass-spring system. 58. Sketch a diagram of a horizontal mass-spring system in three positions: at both extremes of its motion, and in its equilibrium position. In e... |
you study this unit, consider these questions: • What characteristics of an object affect its momentum? • How are momentum and impulse related? Unit Project An Impulsive Water Balloon • By the time you complete this unit, you will have the skills to design a model of an amusement ride that is suitable for a diverse gr... |
goalie’s hand. In this chapter, you will examine how the net force on an object and the time interval during which the force acts affect the motion of the object. Designers of safety equipment for sports and vehicles use this type of analysis when developing new safety devices. In a system of objects, you will also in... |
ramp. Questions 1. What was the approximate angle formed by the paths of the two coins after collision when the coins were (a) the same mass? (b) of different mass? 2. Describe how the speeds of the two coins changed before and after collision. 3. How can you predict which coin will move faster after collision? 1. Und... |
of an avalanche seems imminent, ski patrols reduce the mass of snow along a mountain slope by forcing an avalanche to take place. They do this by targeting large masses of snow with guns or explosives to dislodge the snow. 448 Unit V Momentum and Impulse 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 449 momentum: product ... |
49 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 450 Relating Momentum to Newton’s Second Law e WEB Research how momentum applies to cycling and other sports. Write a brief report of your findings. Begin your search at www.pearsoned.ca/school/ physicssource. The concept of momentum can be used to restate Newton’s second la... |
24/08 2:43 PM Page 451 In Example 9.1, a person in a bumper car is moving at constant velocity. Since both the person and the car move together as a unit, both objects form a system. The momentum of the system is equal to the total mass of the system times the velocity of the system. Example 9.1 W E v Figure 9.6 A 180-... |
s Figure 9.8 Paraphrase The momentum of the car-driver system is 7.5 102 kgm/s [E]. Using Proportionalities to Solve Momentum Problems Example 9.2 demonstrates how to solve momentum problems using proportionalities. In this example, both the mass and velocity of an object change. Example 9.2 An object has a constant mo... |
in terms of momentum is more useful than stating it in terms of acceleration. 5. Explain, in your own words, the difference between momentum and inertia. 6. Provide three examples of situations in which (a) velocity is the dominant factor affecting the momentum of an object (b) mass is the dominant factor affecting th... |
velocity of a 1400-kg car if it has the same momentum? 17. Summarize the concepts and ideas associated with momentum using a graphic organizer of your choice. See Student References 4: Using Graphic Organizers on pp. 869–871 for examples of different graphic organizers. Make sure that the concepts and ideas are clearl... |
do you think the hardness of a surface affects the extent of injury upon impact? 454 Unit V Momentum and Impulse 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 455 9-2 QuickLab 9-2 QuickLab Softening the Hit Problem How is the change in the shape of a putty ball upon impact related to the structure of the landing surface? ... |
A) more cushioned landing surface (B) Figure 9.12 The stopping distance of the putty ball was greater for the more cushioned landing surface (B). So the time interval of interaction was greater on surface B. Chapter 9 The momentum of an isolated system of interacting objects is conserved. 455 09-Phys20-Chap09.qxd 7/24/... |
you maximize t (Figure 9.13). It is also important to note where net acts on a large area, the result of the impact will have a F net acts. If F net acts on only one different effect on the shape of the object than if F small part on the surface of the object. (a) direction of motion (b) direction of motion concrete p... |
is a vector quantity, impulse is also a vector quantity, and the impulse is in the same direction as the net force. To better understand how net force and interaction time affect the change in momentum of an object, do 9-3 Design a Lab. 9-3 Design a Lab 9-3 Design a Lab Providing Impulse The Question What is the effec... |
[S] 2. 190 N [forward] v Figure 9.14 To improve the safety of motorists, modern cars are built so the front end crumples upon impact. A 1200-kg car is travelling at a constant velocity of 8.0 m/s [E] (Figure 9.14). It hits an immovable wall and comes to a complete stop in 0.25 s. (a) Calculate the impulse provided to ... |
c) F netave m kg 3.8 104 2 s 3.8 104 N 9.6 04 0. 3 Ns 1 0 0 s m kg 2.4 105 2 s 2.4 105 N PHYSICS INSIGHT netave is in the opposite F direction to the initial momentum of the car, because from Newton’s third law, the wall is exerting a force directed west on the car. F netave 3.8 104 N [W] F netave 2.4 105 N [W] Paraphr... |
18 Ns In other words, the area under a net force-time graph gives the magnitude of the impulse. Note that a net force acting over a period of time causes a change in momentum. When Fnet is not constant, you can still calculate the impulse by finding the area under a net force-time graph. Figure 9.17 shows the magnitud... |
to do. In addition, the relationship between Fnet and t is usually non-linear, because Fnet increases from zero to a very large value in a short period of time (Figure 9.21). Magnitude of Net Force vs. Interaction Time Fnetave ) Time t (s) Figure 9.21 The average net force gives some idea of the maximum instantaneous ... |
ms 0 N 0 N Required (a) impulse provided to ball (b) velocity of ball after impact (v f ) Analysis and Solution The impulse and velocity after impact are in the east direction since the golfer hits the ball due east. (a) t tf ti 1.1 ms 0.1 ms 1.0 ms or 1.0 103 s Fnet Figure 9.23 magnitude of impulse area under net for... |
) 6.8 m/s 2. (a 30 25 20 15 10 5 0 Magnitude of Average Net Force vs. Interaction Time for a Soccer Ball Being Hit 0 0.03 0.06 Time t (s) 0.09 0.12 (b) 2.5 Ns [W], (c) 0.42 kg 462 Unit V Momentum and Impulse 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 463 The Design of Safety Devices Involves Varying Fnetave and t Many s... |
09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 464 The driver can change the momentum of the snowmobile suddenly by using the brakes. But, as before, the only way that the momentum of the f acts for a long enough time interval. sled can eventually become zero is if F With experience, a driver learns to slow down gradually ... |
. By spreading the force over a greater area, the magnitude of the average net force at any one point on the motorist’s body is reduced, lowering the risk of a major injury. 464 Unit V Momentum and Impulse 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 465 A similar reasoning applies to the cushioning in running shoes and t... |
can be in contact with the ball for a longer period of time. The combination of the greater net force and the longer interaction time increases the change in momentum of the ball. Figure 9.29 When a pitcher exerts a force on the ball during a longer time interval, the momentum of a fastball increases even more. In spo... |
below, what is the magnitude of the impulse provided to a 48-g tennis ball that is served due south? (b) What is the velocity of the ball when the racquet and ball separate? Magnitude of Net Force vs. Interaction Time for a Tennis Ball Being Hit by a Racquet ) 1000 900 800 700 600 500 400 300 200 100 0 0.0 1.0 2.0 3.0... |
net force of magnitude 520 N is applied to a puck for 0.012 s? e TEST To check your understanding of impulse, follow the eTest links at www.pearsoned.ca/school/ physicssource. Chapter 9 The momentum of an isolated system of interacting objects is conserved. 467 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 468 info BIT Th... |
four identical ball bearings or marbles of half the mass (set C) 1-m length of an I-beam curtain rod or two metre-sticks with smooth edges masking tape Procedure 1 Lay the curtain rod flat on a bench to provide a horizontal track for the spheres. Tape the ends of the rod securely. If you are using metre-sticks, tape t... |
oned.ca/school/ physicssource. collision: an interaction between two objects where each receives an impulse Chapter 9 The momentum of an isolated system of interacting objects is conserved. 469 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 470 system: two or more objects that interact with each other Systems of Objects in ... |
In 9-5 Inquiry Lab, a nearly isolated system of objects is net)sys (F involved in a one-dimensional collision. Find a quantitative relationship for the momentum of such a system in terms of momenta before and after collision. 470 Unit V Momentum and Impulse 09-Phys20-Chap09.qxd 7/24/08 2:43 PM Page 471 9-5 Inquiry Lab... |
object 1 at a moderate speed on a collision course with stationary object 2, recording the relevant observations and the masses as trial 3. 10 If you can simultaneously measure the speed of two objects, run trials where both objects are in motion before the collision. Do one trial in which they begin moving toward eac... |
5 Table 9.2 Momentum Final Velocity v 2f (m/s) Change in Momentum of System sys g m s p Before and After for Object 1 Before and After for Object 2 Before and After for System Initial Final Momentum Momentum of System sysi g m p s of System sysf g m p s Initial Trial Momentum 1i g p m s Final Momentum 1f g p m s Initi... |
ap09.qxd 7/24/08 2:43 PM Page 474 Freaction FB on A A B Faction FA on B Figure 9.34 The action-reaction forces when two objects collide e SIM Learn how the momentum of a system just before and just after a one- dimensional collision are related. Vary the ratio of the mass of two pucks. Follow the eSim links at www.pear... |
and immediately after collision that are important, so that the effects of external friction are minimal, and do not significantly affect the outcome. Figure 9.35 During a vehicle collision, many forces cause a change in the velocity and shape of each vehicle. 474 Unit V Momentum and Impulse 09-Phys20-Chap09.qxd 7/24/... |
kerosene and liquid oxygen, producing a total thrust of magnitude 3.34 107 N. The rocket engines in the second and third stages burned a combination of liquid hydrogen and liquid oxygen. The magnitude of the total thrust produced by the second-stage engines was 5.56 106 N, and the third-stage engine produced 1.11 106 ... |
together as a unit after the harpoon is released. So find the total mass of the hunter and kayak. mT mp mk 75 kg 10 kg 85 kg The hunter, kayak, and harpoon each have an initial velocity of zero. So the system has an initial momentum of zero. p sysi 0 Apply the law of conservation of momentum. sysf p p sysi p p p hf Tf... |
)v (mb mdv mb m d f f 0.200 kg 0.012 kg 0.012 kg (0.78 m/s) (0.78 m/s) 0.212 kg 0.012 kg 14 m/s 14 m/s [right] p sysi p p di bi 0 mdv di v di v di Paraphrase Practice Problems 1. A student on a skateboard, with a combined mass of 78.2 kg, is moving east at 1.60 m/s. As he goes by, the student skilfully scoops his 6.4-k... |
kg volleyball is flying west at 2.0 m/s when it strikes a stationary 0.58-kg basketball dead centre. The volleyball rebounds east at 0.79 m/s. What will be the velocity of the basketball immediately after impact? 2. A 9500-kg rail flatcar moving forward at 0.70 m/s strikes a stationary 18 000-kg boxcar, causing it to m... |
/s? vEf Figure 9.41 Required final velocity of Eskimos lineman (v Ef) Analysis and Solution Choose the fullback and lineman as an isolated system. Apply the law of conservation of momentum. p sysi p p Ei Si mEv Ei mEv Ef mSv Si v Ef v Ef Sf Si sysf v v Ei mSv Sf m Sv m E p Ef mEv Ef mEv Ei p p Sf mSv Sf mSv Si m S v m ... |
Elastic and Inelastic Collisions in One Dimension In Examples 9.3 to 9.8, some of the collisions involved hard objects, such as the golf club hitting the golf ball. Other collisions, such as the block and dart, involved a dart that became embedded in a softer material (a block of wood). In all these collisions, it was... |
the system is converted to heat because friction acts on objects in almost all situations. These factors make it difficult to achieve an elastic collision. Even if two colliding objects are hard and do not appear to deform, energy is still lost in the form of sound, light, and/or heat due to friction. Usually, the mea... |
stationary 0.180-kg snooker ball and rebounds at 0.0230 m/s [S]. The snooker ball moves off at 0.465 m/s [N]. Ignore possible rotational effects. Determine if the collision is elastic. 0.160 kg 0.180 kg 0.500 m/s [N] Given mb ms v bi v 0 m/s si v bf v 0.465 m/s [N] sf 0.0230 m/s [S] before after N S vsf 0.465 m/s Requ... |
conserved, the total initial kinetic energy of the system was not equal to the total final kinetic energy of the system after collision. This type of collision is inelastic. In an inelastic collision, the total kinetic energy of the system is not conserved. Eki Ekf One type of inelastic collision occurs when two objec... |
pendulum and the bullet as an isolated system. Since the pendulum is stationary before impact, its initial velocity is zero. So its initial momentum is zero. p pi 0 Immediately after collision, the bullet and pendulum move together as a unit. The kinetic energy of the pendulum-bullet system just after impact is conver... |
073 m/s [forward] from Example 9.10 Required initial and final kinetic energies (Eki and Ekf) to find if the collision is elastic Analysis and Solution Choose the pendulum and the bullet as an isolated system. Calculate the total initial kinetic energy and the total final kinetic energy of the system. Ekf Eki mb(vbi)2 ... |
a mass of 95 kg skates in front of the net at 2.3 m/s [E]. He is met by a 104-kg defenceman skating at 1.2 m/s [W]. What will be the velocity of the resulting tangle of players if they stay together immediately after impact? 4. What evidence suggests that a collision is 10. A 75.6-kg volleyball player leaps toward the... |
elastic. Extension 12. Summarize the concepts and ideas associated with one-dimensional collisions using a graphic organizer of your choice. See Student References 4: Using Graphic Organizers on pp. 869–871 for examples of different graphic organizers. Make sure that the concepts and ideas are clearly presented and ap... |
dimensions. These interactions occur when objects in a plane collide off centre. In 9-1 QuickLab on page 447, you found that when two coins collide off centre, the resulting path of each coin is in a different direction from its initial path. You may have noticed that certain soccer or hockey players seem to be at the... |
8 Using either the spark dots, the physical centre of the puck, or the leading or trailing edge of the puck, measure the distance and the time interval. Record those values in Table 9.3. 9 On the path of each puck after collision, choose an interval where the speed is constant. Measure the distance, direction of motio... |
1 2 3 4 5 Table 9.4 Velocity and Momentum Before and After for Puck 1 After for Puck 2 Initial x Final x Initial x Velocity Momentum Velocity Final y Final x Velocity Momentum Momentum Velocity Final y Final x (m/s) p1ix gm v1fx v1ix (m/s) v1fy (m/s) p1fx gm p1fy gm v2fx (m/s) v2fy s s Final x Final y Final y Velocity... |
but its speed remain the same? Explain, using an example. Example 9.12 involves a curling stone colliding off centre with an identical stone that is at rest. The momentum of each stone is analyzed in two perpendicular directions. Example 9.12 A 19.6-kg curling stone (A) moving at 1.20 m/s [N] strikes another identical... |
mAvAiN mAvAfN mBvBiN (19.6 kg)(1.20 m/s) 0 (19.6 kg)(1.17 m/s)(cos 12.0) 1.089 kgm/s Draw a vector diagram of the components of the final momentum of stone B and find the magnitude of the resultant p Pythagorean theorem. Bf using the N 1.089 kg m/s W Figure 9.50 p Bf θ 4.768 kg m/s E pBf (4.768 kgm/s)2 (1.089 kgm/s)2 ... |
-Phys20-Chap09.qxd 7/24/08 2:44 PM Page 492 centre of mass: point where the total mass of an object can be assumed to be concentrated info BIT When an object is symmetric and has uniform density, its centre of mass is in the same location as the physical centre of the object. Example 9.13 involves a football tackle wit... |
0 m/s vqi x vf? Figure 9.51 Required final velocity of centre of mass of the two players (v f) Analysis and Solution Choose the quarterback and the linebacker as an isolated system. The linebacker tackled the quarterback. So both players have the same final velocity. Resolve all velocities into x and y components. Vect... |
of interacting objects is conserved. 493 09-Phys20-Chap09.qxd 7/24/08 2:44 PM Page 494 Example 9.14 deals with a fireworks bundle that is initially stationary. After it explodes, three fragments (A, B, and C) fly in different directions in a plane. To demonstrate an alternative method of solving collision problems, a ... |
an isolated system. Since no mass is lost, find the mass of fragment C. mT mB) 0.60 kg (0.20 kg 0.18 kg) 0.22 kg (mA mC The original firework has an initial velocity of zero. So the system has an initial momentum of zero. p sysi 0 pAf The momentum of each fragment is in the same direction as its velocity. Calculate th... |
velocity vector, it is possible to calculate the kinetic energy. An example of an inelastic collision occurs when two objects join together and move as a unit immediately after impact. If two objects bounce apart after impact, the collision may be either elastic or inelastic, depending on the initial and final kinetic... |
change if the track were made of a soft material that deforms easily? Example 9.15 Determine if the collision in Example 9.12 on pages 490 and 491 is elastic. If it is not, what percent of the kinetic energy is retained? Given mA v Bi v Bf 19.6 kg 0 m/s 0.2495 m/s [77.1 W of N] mB v Af 19.6 kg 1.17 m/s [12.0 E of N] v... |
-kg goalie moving at 0.200 m/s [0]. The velocity of the centre of mass of the goalie, pads, and puck immediately after collision is 0.192 m/s [333]. Was the collision elastic? If not, calculate the percent of total kinetic energy retained. 2. A 19.0-kg curling stone collides with another identical stationary stone. Imm... |
PM Page 498 electron neutron pn 0 kgm/s proton pe pp Figure 9.57 If a neutron is initially stationary, p 0. If the neutron becomes transformed into a proton and an electron moving in the same direction, the momentum of the system is no longer zero. sysi Scientists later found that the neutron, when isolated, soon beca... |
all immersed in a 10-storey chamber of purified water. When a neutrino collides with a heavy water molecule, a tiny burst of light is emitted, which the photo detectors pick up. Despite all that equipment, scientists only detect an average of about 10 neutrinos a day. So experiments acrylic vessel with heavy water ves... |
a stationary five-ball, causing it to move at 0.601 m/s [230]. The cue ball and the five-ball each have a mass of 160 g. What will be the velocity of the cue ball immediately after impact? Ignore frictional and rotational effects. 6. A stationary 230-kg bumper car in a carnival is struck off centre from behind by a 25... |
4-m drop, where the impulse changes the magnitude and direction of the momentum while maintaining the integrity of the balloon. The water balloon must begin with a vertical drop equivalent to eight storeys. Then for the equivalent height of six storeys, the balloon must change direction and come to a stop horizontally.... |
In what ways could your ideas have a practical use, such as getting people off a high oil derrick or out of a high-rise building quickly and safely? 4. What conditions would cause a person to be an unacceptable candidate for your ride? Write out a list of rules or requirements that would need to be posted. *Note: Your... |
are conserved. Example 9.9 Inelastic collisions are collisions in which a system of objects has different initial and final kinetic energy values. Example 9.11 9.4 Collisions in Two Dimensions Momentum is conserved when objects in an isolated system interact in two dimensions. An isolated system has no external net fo... |
. For a given impulse, what is the effect of (a) increasing the time interval? (b) decreasing the net force during interaction? 17. For each situation, explain how you would effectively provide the required impulse. • to catch a water balloon tossed from some distance • to design a hiking boot for back-country hiking o... |
volleyball being blocked. The velocity of the ball changes from 18 m/s [N] to 11 m/s [S]. (a) Using the graph, calculate the magnitude of the impulse on the volleyball. (b) What is the mass of the ball? Magnitude of Net Force vs. Interaction Time for a Volleyball Block ) 5000 4000 3000 2000 1000 0 0.0 1.0 3.0 2.0 Time... |
the conservation of momentum to be valid if two objects move faster just before, than just after, collision? Explain, using an example. 35. Fighter pilots have reported that immediately after a burst of gunfire from their jet fighter, the speed of their aircraft decreased by 50–65 km/h. Explain the reason for this cha... |
1500 1000 500 0 0.0 1.0 2.0 3.0 Time t (ms) 4.0 5.0 6.0 50. A Centaur rocket engine expels 520 kg of exhaust gas at 5.0 104 m/s in 0.40 s. What is the magnitude of the net force on the rocket that will be generated? 51. An elevator with passengers has a total mass of 1700 kg. What is the net force on the cable needed ... |
60-kg pistol is struck by a 15-g bullet travelling at 280 m/s [50.0]. If the bullet moves at 130 m/s [280] after the interaction, what will be the velocity of the pistol? Assume that no external force acts on the pistol. 58. A 52.5-kg snowboarder, travelling at 1.24 m/s [N] at the end of her run, jumps and kicks off he... |
an external force on the golf club after initial contact with the ball. If the collision between the golf club and the ball is elastic, what will be the speed of the club head immediately after impact? (b) Show that the law of conservation of momentum is valid in this interaction. 63. A student on a skateboard is trav... |
between the crate and the truck bed is 0.30, will the crate slide forward as the truck stops? Justify your answer with calculations. 68. A firecracker bursts into three fragments. An 8.5-g fragment (A) flies away at 25 m/s [S]. A 5.6-g fragment (B) goes east at 12 m/s. Calculate the velocity of the 6.7-g fragment (C).... |
[36.0]. The cue ball and three-ball each have a mass of 0.160 kg. Calculate the velocity of the cue ball immediately after collision. Ignore friction and rotational effects. 74. A hunter claims to have shot a charging bear through the heart and “dropped him in his tracks.” To immediately stop the bear, the momentum of... |
statements. 81. Research the developments in running shoes that help prevent injuries. Interview running consultants, and consult sales literature and the Internet. How does overpronation or underpronation affect your body’s ability to soften the road shock on your knees and other joints? Write a brief report of your ... |
Lines and Electric Potential 11.3 Electrical Interactions and the Law of Conservation of Energy C H A P T E R 1 2 Properties of electric and magnetic fields apply in nature and technology. 12.1 Magnetic Forces and Fields 12.2 Moving Charges and Magnetic Fields 12.3 Current-carrying Conductors and Magnetic Fields 12.4 ... |
T E R 10 Key Concepts In this chapter, you will learn about: electric charge conservation of charge Coulomb’s law Learning Outcomes When you have completed this chapter, you will be able to: Knowledge explain electrical interactions using the law of conservation of charge explain electrical interactions in terms of th... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.