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13. 2 thermal expansion of solids and liquids 5. thermal stresses caused by uneven cooling can easily break glass cookware. explain why pyrex®, a glass with a small coefficient of linear expansion, is less susceptible. 6. water expands significantly when it freezes : a volume increase of about 9 % occurs. as a result o... | openstax_college_physics_2e-web_7zesafu | [
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and molecular explanation of pressure and temperature 13. how is momentum related to the pressure exerted by a gas? explain on the atomic and molecular level, considering the behavior of atoms and molecules. 13 • conceptual questions 571 | openstax_college_physics_2e-web_7zesafu | [
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13. 5 phase changes 14. a pressure cooker contains water and steam in equilibrium at a pressure greater than atmospheric pressure. how does this greater pressure increase cooking speed? 15. why does condensation form most rapidly on the coldest object in a room — for example, on a glass of ice water? 16. what is the va... | openstax_college_physics_2e-web_7zesafu | [
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13. 1 temperature 1. what is the fahrenheit temperature of a person with a fever? 2. frost damage to most plants occurs at temperatures of or lower. what is this temperature on the kelvin scale? 3. to conserve energy, room temperatures are kept at in the winter and in the summer. what are these temperatures on the cels... | openstax_college_physics_2e-web_7zesafu | [
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13. 2 thermal expansion of solids and liquids 9. the height of the washington monument is measured to be 170 m on a day when the temperature is. what will its height be on a day when the temperature falls to? although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as mar... | openstax_college_physics_2e-web_7zesafu | [
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an alloy of iron and nickel ) are the same length at. what is their difference in length at? ( b ) repeat the calculation for two 30. 0 - m - long surveyor ’ s tapes. 17. ( a ) if a 500 - ml glass beaker is filled to the brim with ethyl alcohol at a temperature of how much will overflow when its temperature reaches? ( ... | openstax_college_physics_2e-web_7zesafu | [
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3. 00 mm in the glass cup. show that this decrease cannot be due to thermal contraction by calculating the decrease in level if the of coffee is in a 7. 00 - cm - diameter cup and decreases in temperature from to ( most of the drop in level is actually due to escaping bubbles of air. ) 20. ( a ) the density of water at... | openstax_college_physics_2e-web_7zesafu | [
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13. 3 the ideal gas law 22. the gauge pressure in your car tires is at a temperature of when you drive it onto a ferry boat to alaska. what is their gauge pressure later, when their temperature has dropped to? 23. convert an absolute pressure of to gauge pressure in ( this value was stated to be just less than in examp... | openstax_college_physics_2e-web_7zesafu | [
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20. 0 times its original volume? ( b ) what is the gauge pressure? ( assume the pressure in the lab remains at 1. 00 atmosphere during the experiment. ) 26. confirm that the units of are those of energy for each value of : ( a ), ( b ), and ( c ). 27. in the text, it was shown that for gas at stp. ( a ) show that this ... | openstax_college_physics_2e-web_7zesafu | [
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atmospheric pressure? assume tire temperature and volume remain constant. 34. a high - pressure gas cylinder contains 50. 0 l of toxic gas at a pressure of and a temperature of. its valve leaks after the cylinder is dropped. the cylinder is cooled to dry ice temperature to reduce the leak rate and pressure so that it c... | openstax_college_physics_2e-web_7zesafu | [
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13. 4 kinetic theory : atomic and molecular explanation of pressure and temperature 39. some incandescent light bulbs are filled with argon gas. what is for argon atoms near the filament, assuming their temperature is 2500 k? 40. average atomic and molecular speeds are large, even at low temperatures. what is for heliu... | openstax_college_physics_2e-web_7zesafu | [
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11. 2 km / s. ( a ) express this speed in m / s and km / h. ( b ) at what temperature would oxygen molecules ( molecular mass is equal to 32. 0 g / mol ) have an average velocity equal to earth ’ s escape velocity of 11. 1 km / s? 43. the escape velocity from the moon is much smaller than from earth and is only 2. 38 k... | openstax_college_physics_2e-web_7zesafu | [
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2. 016 g / mol ) have an average velocity equal to 193 m / s. what is the temperature? 47. much of the gas near the sun is atomic hydrogen. its temperature would have to be for the average velocity to equal the escape velocity from the sun. what is that velocity? 48. there are two important isotopes of uranium — and ; ... | openstax_college_physics_2e-web_7zesafu | [
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13. 6 humidity, evaporation, and boiling 49. dry air is 78. 1 % nitrogen. what is the partial pressure of nitrogen when the atmospheric pressure is? 50. ( a ) what is the vapor pressure of water at? ( b ) what percentage of atmospheric pressure does this correspond to? ( c ) what percent of air is water vapor if it has... | openstax_college_physics_2e-web_7zesafu | [
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of water at is. using the ideal gas law, calculate the density of water vapor in that creates a partial pressure equal to this vapor pressure. the result should be the same as the saturation vapor density at that temperature 59. air in human lungs has a temperature of and a saturation vapor density of. ( a ) if | openstax_college_physics_2e-web_7zesafu | [
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2. 00 l of air is exhaled and very dry air inhaled, what is the maximum loss of water vapor by the person? ( b ) calculate the partial pressure of water vapor having this density, and compare it with the vapor pressure of. 13 • problems & exercises 575 60. if the relative humidity is 90. 0 % on a muggy summer morning w... | openstax_college_physics_2e-web_7zesafu | [
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at sea level? ( b ) at what temperature will this water boil? ( c ) is a significantly higher temperature needed to boil water at a greater depth? 67. integrated concepts to get an idea of the small effect that temperature has on archimedes ’ principle, calculate the fraction of a copper block ’ s weight that is suppor... | openstax_college_physics_2e-web_7zesafu | [
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this result? ( c ) which premise is responsible? 576 13 • problems & exercises access for free at openstax. org introduction to heat and heat transfer methods chapter 14 heat and heat transfer methods 14. 1 heat 14. 2 temperature change and heat capacity 14. 3 phase change and latent heat 14. 4 heat transfer methods 14... | openstax_college_physics_2e-web_7zesafu | [
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14. 1 heat learning objectives by the end of this section, you will be able to : • define heat as transfer of energy. in work, energy, and energy resources, we defined work as force times distance and learned that work done on an object changes its kinetic energy. we also saw in temperature, kinetic theory, and the gas... | openstax_college_physics_2e-web_7zesafu | [
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##orie ( cal ) is a common unit of energy, defined as the energy needed to change the temperature of 1. 00 g of water by — specifically, between and, since there is a slight temperature dependence. perhaps the most common unit of heat is the kilocalorie ( kcal ), which is the energy needed to change the temperature of ... | openstax_college_physics_2e-web_7zesafu | [
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14. 1 578 14 • heat and heat transfer methods access for free at openstax. org figure 14. 3 schematic depiction of joule ’ s experiment that established the equivalence of heat and work. the figure above shows one of joule ’ s most famous experimental setups for demonstrating the mechanical equivalent of heat. it demon... | openstax_college_physics_2e-web_7zesafu | [
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substance. however, the properties of the sample only depend on the internal energy so that it is impossible to tell whether heat was added to sample a or b. 14. 2 temperature change and heat capacity learning objectives by the end of this section, you will be able to : • observe heat transfer and change in temperature... | openstax_college_physics_2e-web_7zesafu | [
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14. 2 • temperature change and heat capacity 579 figure 14. 4 the heat transferred to cause a temperature change depends on the magnitude of the temperature change, the mass of the system, and the substance and phase involved. ( a ) the amount of heat transferred is directly proportional to the temperature change. to d... | openstax_college_physics_2e-web_7zesafu | [
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the specific heat of water is five times that of glass and ten times that of iron, which means that it takes five times as much heat to raise the temperature of water the same amount as for glass and ten times as much heat to raise the temperature of water as for iron. in fact, water has one of the largest specific hea... | openstax_college_physics_2e-web_7zesafu | [
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14. 2 580 14 • heat and heat transfer methods access for free at openstax. org example 14. 1 calculating the required heat : heating water in an aluminum pan a 0. 500 kg aluminum pan on a stove is used to heat 0. 250 liters of water from to. ( a ) how much heat is required? what percentage of the heat is used to raise ... | openstax_college_physics_2e-web_7zesafu | [
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for the water as compared to the aluminum pan. 14. 3 14. 4 14. 5 14. 6 14. 7 14. 8 | openstax_college_physics_2e-web_7zesafu | [
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14. 2 • temperature change and heat capacity 581 figure 14. 5 the smoking brakes on this truck are a visible evidence of the mechanical equivalent of heat. example 14. 2 calculating the temperature increase from the work done on a substance : truck brakes overheat on downhill runs truck brakes used to control speed on ... | openstax_college_physics_2e-web_7zesafu | [
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granite ( average ) 840 0. 20 copper 387 0. 0924 glass 840 0. 20 gold 129 0. 0308 human body ( average at 37 °c ) 3500 0. 83 ice ( average, - 50°c to 0°c ) 2090 0. 50 iron, steel 452 0. 108 lead 128 0. 0305 silver 235 0. 0562 wood 1700 0. 4 liquids benzene 1740 0. 415 ethanol 2450 0. 586 glycerin 2410 0. 576 mercury 13... | openstax_college_physics_2e-web_7zesafu | [
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0. 363 ( 0. 482 ) table 14. 1 specific heats3 of various substances note that example 14. 2 is an illustration of the mechanical equivalent of heat. alternatively, the temperature increase could be produced by a blow torch instead of mechanically. example 14. 3 calculating the final temperature when heat is transferred... | openstax_college_physics_2e-web_7zesafu | [
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all terms involving on the left hand side and all other terms on the right hand side. solve for, and insert the numerical values : 14. 12 14. 13 14. 14 14. 15 | openstax_college_physics_2e-web_7zesafu | [
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14. 16 pressure of 1. 00 atm. 584 14 • heat and heat transfer methods access for free at openstax. org discussion this is a typical calorimetry problem — two bodies at different temperatures are brought in contact with each other and exchange heat until a common temperature is reached. why is the final temperature so m... | openstax_college_physics_2e-web_7zesafu | [
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14. 3 phase change and latent heat learning objectives by the end of this section, you will be able to : • examine heat transfer. • calculate final temperature from heat transfer. so far we have discussed temperature change due to heat transfer. no temperature change occurs from heat transfer if ice melts and becomes l... | openstax_college_physics_2e-web_7zesafu | [
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14. 3 • phase change and latent heat 585 figure 14. 6 heat from the air transfers to the ice causing it to melt. ( credit : mike brand ) energy is required to melt a solid because the cohesive bonds between the molecules in the solid must be broken apart such that, in the liquid, the molecules can move around at compar... | openstax_college_physics_2e-web_7zesafu | [
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14. 18 586 14 • heat and heat transfer methods access for free at openstax. org figure 14. 7 ( a ) energy is required to partially overcome the attractive forces between molecules in a solid to form a liquid. that same energy must be removed for freezing to take place. ( b ) molecules are separated by large distances w... | openstax_college_physics_2e-web_7zesafu | [
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##al / kg boiling point ( °c ) kj / kg kcal / kg helium −269. 7 5. 23 1. 25 −268. 9 20. 9 4. 99 hydrogen −259. 3 58. 6 14. 0 −252. 9 452 108 table 14. 2 heats of fusion and vaporization 6 6 values quoted at the normal melting and boiling temperatures at standard atmospheric pressure ( 1 atm ). 14. 3 • phase change and ... | openstax_college_physics_2e-web_7zesafu | [
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32. 0 2595 5069 1211 uranium 1133 84 20 3900 1900 454 tungsten 3410 184 44 5900 4810 1150 table 14. 2 heats of fusion and vaporization 6 phase changes can have a tremendous stabilizing effect even on temperatures that are not near the melting and boiling points, because evaporation and condensation ( conversion of a ga... | openstax_college_physics_2e-web_7zesafu | [
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added. the system is constructed so that no vapor evaporates while ice warms to become liquid water, and so that, when vaporization occurs, the vapor remains in of the system. the long stretches of constant temperature values at and reflect the large latent heat of melting and vaporization, respectively. water can evap... | openstax_college_physics_2e-web_7zesafu | [
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since no heat is lost,, so that bring all terms involving on the left - hand - side and all other terms on the right - hand - side. solve for the unknown quantity : solution 1. identify the known quantities. the mass of ice is and the mass of soda is. 14. 19 14. 20 14. 21 | openstax_college_physics_2e-web_7zesafu | [
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14. 3 • phase change and latent heat 589 2. calculate the terms in the numerator : and 3. calculate the denominator : 4. calculate the final temperature : discussion this example illustrates the enormous energies involved during a phase change. the mass of ice is about 7 percent the mass of water but leads to a noticea... | openstax_college_physics_2e-web_7zesafu | [
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14. 25 real - world application energy is also released when a liquid freezes. this phenomenon is used by fruit growers in florida to protect oranges when the temperature is close to the freezing point. growers spray water on the plants in orchards so that the water freezes and heat is released to the growing oranges o... | openstax_college_physics_2e-web_7zesafu | [
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the heat of sublimation, which is the energy required to change 1. 00 kg of a substance from the solid phase to the vapor phase. is analogous to and, and its value depends on the substance. sublimation requires energy input, so that dry ice is an effective coolant, whereas the reverse process ( i. e., frosting ) releas... | openstax_college_physics_2e-web_7zesafu | [
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14. 3 • phase change and latent heat 591 that for other phase transitions. the material presented in this section and the preceding section allows us to calculate any number of effects related to temperature and phase change. in each case, it is necessary to identify which temperature and phase changes are taking place... | openstax_college_physics_2e-web_7zesafu | [
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reasonable : does it make sense? as an example, be certain that the temperature change does not also cause a phase change that you have not taken into account. check your understanding why does snow remain on mountain slopes even when daytime temperatures are higher than the freezing temperature? solution snow is forme... | openstax_college_physics_2e-web_7zesafu | [
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14. 4 heat transfer methods learning objectives by the end of this section, you will be able to : • discuss the different methods of heat transfer. equally as interesting as the effects of heat transfer on a system are the methods by which this occurs. whenever there is a temperature difference, heat transfer occurs. h... | openstax_college_physics_2e-web_7zesafu | [
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through conduction into the room, but at a much slower rate. heat transfer by convection also occurs through cold air entering the room around windows and hot air leaving the room by rising up the chimney. we examine these methods in some detail in the three following modules. each method has unique and interesting cha... | openstax_college_physics_2e-web_7zesafu | [
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14. 5 • conduction 593 figure 14. 13 insulation is used to limit the conduction of heat from the inside to the outside ( in winters ) and from the outside to the inside ( in summers ). ( credit : giles douglas ) your feet feel cold as you walk barefoot across the living room carpet in your cold house and then step onto... | openstax_college_physics_2e-web_7zesafu | [
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different average kinetic energies. collisions occurring at the contact surface tend to transfer energy from high - temperature regions to low - temperature regions. in this illustration, a molecule in the lower temperature region ( right side ) has low energy before collision, but its energy increases after colliding ... | openstax_college_physics_2e-web_7zesafu | [
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##calories per second, is the thermal conductivity of the material, and are its surface area and thickness, as shown in figure 14. 15, and is the temperature difference across the slab. table 14. 3 gives representative values of thermal conductivity. example 14. 5 calculating heat transfer through conduction : conducti... | openstax_college_physics_2e-web_7zesafu | [
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14. 5 • conduction 595 2. identify the unknowns. we need to solve for the mass of the ice,. we will also need to solve for the net heat transferred to melt the ice,. 3. determine which equations to use. the rate of heat transfer by conduction is given by 4. the heat is used to melt the ice : 5. insert the known values ... | openstax_college_physics_2e-web_7zesafu | [
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0. 042 wool 0. 04 down feathers 0. 025 air 0. 023 styrofoam | openstax_college_physics_2e-web_7zesafu | [
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0. 010 table 14. 3 thermal conductivities of common substances7 a combination of material and thickness is often manipulated to develop good insulators — the smaller the conductivity and the larger the thickness, the better. the ratio of will thus be large for a good insulator. the ratio is called the factor. the rate ... | openstax_college_physics_2e-web_7zesafu | [
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14. 5 • conduction 597 example 14. 6 calculating the temperature difference maintained by a heat transfer : conduction through an aluminum pan water is boiling in an aluminum pan placed on an electrical element on a stovetop. the sauce pan has a bottom that is 0. 800 cm thick and 14. 0 cm in diameter. the boiling water... | openstax_college_physics_2e-web_7zesafu | [
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was to be only through conduction. in another example, car engines would overheat unless there was a more efficient way to remove excess heat from the pistons. check your understanding how does the rate of heat transfer by conduction change when all spatial dimensions are doubled? solution because area is the product o... | openstax_college_physics_2e-web_7zesafu | [
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14. 6 convection learning objectives by the end of this section, you will be able to : • discuss the method of heat transfer by convection. convection is driven by large - scale flow of matter. in the case of earth, the atmospheric circulation is caused by the flow of hot air from the tropics to the poles, and the flow... | openstax_college_physics_2e-web_7zesafu | [
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like this one, can be quite efficient in uniformly heating a home. figure 14. 18 convection plays an important role in heat transfer inside this pot of water. once conducted to the inside, heat transfer to other parts of the pot is mostly by convection. the hotter water expands, decreases in density, and rises to trans... | openstax_college_physics_2e-web_7zesafu | [
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14. 6 • convection 599 example 14. 7 calculating heat transfer by convection : convection of air through the walls of a house most houses are not airtight : air goes in and out around doors and windows, through cracks and crevices, following wiring to switches and outlets, and so on. the air in a typical house is compl... | openstax_college_physics_2e-web_7zesafu | [
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longer turnover times are unhealthy, because a minimum amount of fresh air is necessary to supply oxygen for breathing and to dilute household pollutants. the term used for the process by which outside air leaks into the house from cracks around windows, doors, and the foundation is called “ air infiltration. ” a cold ... | openstax_college_physics_2e-web_7zesafu | [
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14. 39 600 14 • heat and heat transfer methods access for free at openstax. org moving air temperature wind speed ( m / s ) table 14. 4 wind - chill factors although air can transfer heat rapidly by convection, it is a poor conductor and thus a good insulator. the amount of available space for airflow determines whethe... | openstax_college_physics_2e-web_7zesafu | [
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14. 6 • convection 601 example 14. 8 calculate the flow of mass during convection : sweat - heat transfer away from the body the average person produces heat at the rate of about 120 w when at rest. at what rate must water evaporate from the body to get rid of all this energy? ( this evaporation might occur when a pers... | openstax_college_physics_2e-web_7zesafu | [
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storms, with lightning and hail, and constitute the mechanism driving hurricanes. 14. 40 14. 41 | openstax_college_physics_2e-web_7zesafu | [
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14. 42 602 14 • heat and heat transfer methods access for free at openstax. org figure 14. 20 cumulus clouds are caused by water vapor that rises because of convection. the rise of clouds is driven by a positive feedback mechanism. ( credit : mike love ) figure 14. 21 convection accompanied by a phase change releases t... | openstax_college_physics_2e-web_7zesafu | [
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14. 7 radiation learning objectives by the end of this section, you will be able to : • discuss heat transfer by radiation. • explain the power of different materials. you can feel the heat transfer from a fire and from the sun. similarly, you can sometimes tell that the oven is hot without touching its door or looking... | openstax_college_physics_2e-web_7zesafu | [
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figure below by the height of the distribution. electromagnetic waves explains more about the electromagnetic spectrum and introduction to quantum physics discusses how the decrease in wavelength corresponds to an increase in energy. 604 14 • heat and heat transfer methods access for free at openstax. org figure 14. 24... | openstax_college_physics_2e-web_7zesafu | [
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on the right has melted ), although both have been in the sunlight for the same time. the thermal conductivities of the pavements are the same. gray objects have a uniform ability to absorb all parts of the electromagnetic spectrum. colored objects behave in similar but more complex ways, which gives them a particular ... | openstax_college_physics_2e-web_7zesafu | [
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14. 7 • radiation 605 figure 14. 26 a black object is a good absorber and a good radiator, while a white ( or silver ) object is a poor absorber and a poor radiator. it is as if radiation from the inside is reflected back into the silver object, whereas radiation from the inside of the black object is “ absorbed ” when... | openstax_college_physics_2e-web_7zesafu | [
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14. 43 606 14 • heat and heat transfer methods access for free at openstax. org spectrum. thus, we are all nearly ( jet ) black in the infrared, in spite of the obvious variations in skin color. this high infrared emissivity is why we can so easily feel radiation on our skin. it is also the basis for the use of night s... | openstax_college_physics_2e-web_7zesafu | [
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this by using the equation for the rate of radiative heat transfer. solution insert the temperatures values and, so that discussion this value is a significant rate of heat transfer to the environment ( note the minus sign ), considering that a person at rest may produce energy at the rate of 125 w and that conduction ... | openstax_college_physics_2e-web_7zesafu | [
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14. 7 • radiation 607 energy transfer is less than the equation for the radiative heat transfer would predict because the sun does not fill the sky. the average emissivity ( ) of the earth is about 0. 65, but the calculation of this value is complicated by the fact that the highly reflective cloud coverage varies great... | openstax_college_physics_2e-web_7zesafu | [
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. 28 the greenhouse effect is a name given to the trapping of energy in the earth ’ s atmosphere by a process similar to that used in greenhouses. the atmosphere, like window glass, is transparent to incoming visible radiation and most of the sun ’ s infrared. these wavelengths are absorbed by the earth and re - emitte... | openstax_college_physics_2e-web_7zesafu | [
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allows for comfortable living in most 608 14 • heat and heat transfer methods access for free at openstax. org parts of the united states with hot and humid summers and cold winters. figure 14. 29 this simple but effective solar cooker uses the greenhouse effect and reflective material to trap and retain solar energy. ... | openstax_college_physics_2e-web_7zesafu | [
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type of heat transfer is involved. 2. identify the type ( s ) of heat transfer — conduction, convection, or radiation. 3. identify exactly what needs to be determined in the problem ( identify the unknowns ). a written list is very useful. 4. make a list of what is given or can be inferred from the problem as stated ( ... | openstax_college_physics_2e-web_7zesafu | [
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14. 7 • radiation 609 net heat transfer rate. 7. insert the knowns along with their units into the appropriate equation and obtain numerical solutions complete with units. 8. check the answer to see if it is reasonable. does it make sense? 610 14 • heat and heat transfer methods access for free at openstax. org glossar... | openstax_college_physics_2e-web_7zesafu | [
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to conduct heat section summary 14. 1 heat • heat and work are the two distinct methods of energy transfer. • heat is energy transferred solely due to a temperature difference. • any energy unit can be used for heat transfer, and the most common are kilocalorie ( kcal ) and joule ( j ). • kilocalorie is defined to be t... | openstax_college_physics_2e-web_7zesafu | [
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energy from cold regions to warm ones. 14. 7 radiation • radiation is the rate of heat transfer through the emission or absorption of electromagnetic waves. • the rate of heat transfer depends on the surface area and the fourth power of the absolute temperature : where is the stefan - boltzmann constant and is the emis... | openstax_college_physics_2e-web_7zesafu | [
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14. 3 phase change and latent heat 6. heat transfer can cause temperature and phase changes. what else can cause these changes? 7. how does the latent heat of fusion of water help slow the decrease of air temperatures, perhaps preventing temperatures from falling significantly below, in the vicinity of large bodies of ... | openstax_college_physics_2e-web_7zesafu | [
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when cold, the shrunken balloon has a small amount of light blue liquid in it, as well as some snow - like crystals. as it warms up, the liquid boils, and part of the crystals sublimate, with some crystals lingering for awhile and then producing a liquid. identify the blue liquid and the two solids in the cold balloon.... | openstax_college_physics_2e-web_7zesafu | [
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14. 4 heat transfer methods 17. what are the main methods of heat transfer from the hot core of earth to its surface? from earth ’ s surface to outer space? 18. when our bodies get too warm, they respond by sweating and increasing blood circulation to the surface to transfer thermal energy away from the core. what effe... | openstax_college_physics_2e-web_7zesafu | [
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. on cold, clear nights horses will sleep under the cover of large trees. how does this help them keep warm? | openstax_college_physics_2e-web_7zesafu | [
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14. 7 radiation 24. when watching a daytime circus in a large, dark - colored tent, you sense significant heat transfer from the tent. explain why this occurs. 25. satellites designed to observe the radiation from cold ( 3 k ) dark space have sensors that are shaded from the sun, earth, and moon and that are cooled to ... | openstax_college_physics_2e-web_7zesafu | [
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1. 00 kg of the following, originally at : ( a ) water ; ( b ) concrete ; ( c ) steel ; and ( d ) mercury. 5. rubbing your hands together warms them by converting work into thermal energy. if a woman rubs her hands back and forth for a total of 20 rubs, at a distance of 7. 50 cm per rub, and with an average frictional ... | openstax_college_physics_2e-web_7zesafu | [
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of fission products. this heat transfer causes a rapid increase in temperature if the cooling system fails ( 1 watt = 1 joule / second or 1 w = 1 j / s and 1 mw = 1 megawatt ). ( a ) calculate the rate of temperature increase in degrees celsius per second if the mass of the reactor core is and it has an average specifi... | openstax_college_physics_2e-web_7zesafu | [
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14. 3 phase change and latent heat 11. how much heat transfer ( in kilocalories ) is required to thaw a 0. 450 - kg package of frozen vegetables originally at if their heat of fusion is the same as that of water? 12. a bag containing ice is much more effective in absorbing energy than one containing the same amount of ... | openstax_college_physics_2e-web_7zesafu | [
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to, including the energy needed for phase changes? ( b ) how much time is required for each stage, assuming a constant 20. 0 kj / s rate of heat transfer? ( c ) make a graph of temperature versus time for this process. 18. in 1986, a gargantuan iceberg broke away from the ross ice shelf in antarctica. it was approximat... | openstax_college_physics_2e-web_7zesafu | [
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into the atmosphere for a small storm of radius 1 km, assuming that 1. 0 cm of rain is precipitated uniformly over this area. 22. to help prevent frost damage, 4. 00 kg of water is sprayed onto a fruit tree. ( a ) how much heat transfer occurs as the water freezes? ( b ) how much would the temperature of the 200 - kg t... | openstax_college_physics_2e-web_7zesafu | [
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0. 400 kg of water in a very well - insulated container. what is the final temperature? 25. if you pour 0. 0100 kg of water onto a 1. 20 - kg block of ice ( which is initially at ), what is the final temperature? you may assume that the water cools so rapidly that effects of the surroundings are negligible. 26. indigen... | openstax_college_physics_2e-web_7zesafu | [
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raise the temperature and melt 0. 500 kg of lead, starting from? | openstax_college_physics_2e-web_7zesafu | [
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14. 5 conduction 30. ( a ) calculate the rate of heat conduction through house walls that are 13. 0 cm thick and that have an average thermal conductivity twice that of glass wool. assume there are no windows or doors. the surface area of the walls is and their inside surface is at, while their outside surface is at. (... | openstax_college_physics_2e-web_7zesafu | [
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bed of hot coals without sustaining burns. calculate the heat transferred by conduction into the sole of one foot of a firewalker given that the bottom of the foot is a 3. 00 - mm - thick callus with a conductivity at the low end of the range for wood and its density is. the area of contact is, the temperature of the c... | openstax_college_physics_2e-web_7zesafu | [
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clothing at the rate of 50. 0 w. what is the temperature difference across the clothing, given the surface area is? 40. some stove tops are smooth ceramic for easy cleaning. if the ceramic is 0. 600 cm thick and heat conduction occurs through the same area and at the same rate as computed in example 14. 6, what is the ... | openstax_college_physics_2e-web_7zesafu | [
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industries, a payback period is as small as two years. ) suppose you wish to install the extra insulation in exercise 9. 41. if energy cost $ 1. 00 per million joules and the insulation was $ 4. 00 per square meter, then calculate the simple payback time. take the average for the 120 day heating season to be. 14 • prob... | openstax_college_physics_2e-web_7zesafu | [
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14. 6 convection 45. at what wind speed does air cause the same chill factor as still air at? 46. at what temperature does still air cause the same chill factor as air moving at 15 m / s? 47. the “ steam ” above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the ho... | openstax_college_physics_2e-web_7zesafu | [
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##lauea volcano in hawaii. ( credit : j. p. eaton, u. s. geological survey ) 52. during heavy exercise, the body pumps 2. 00 l of blood per minute to the surface, where it is cooled by. what is the rate of heat transfer from this forced convection alone, assuming blood has the same specific heat as water and its densit... | openstax_college_physics_2e-web_7zesafu | [
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14. 7 radiation 55. at what net rate does heat radiate from a black roof on a night when the roof ’ s temperature is and the surrounding temperature is? the emissivity of the roof is 0. 900. 56. ( a ) cherry - red embers in a fireplace are at and have an exposed area of and an emissivity of 0. 980. the surrounding room... | openstax_college_physics_2e-web_7zesafu | [
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0. 750 and a surface area. ( b ) is this a significant fraction of the heat transfer by an automobile engine? to answer this, assume a horsepower of and the efficiency of automobile engines as 25 %. 59. find the net rate of heat transfer by radiation from a skier standing in the shade, given the following. she is compl... | openstax_college_physics_2e-web_7zesafu | [
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into 3 - k space. ( b ) how much power does the sun radiate per square meter of its surface? ( c ) how much power in watts per square meter is that value at the distance of earth, away? ( this number is called the solar constant. ) 63. a large body of lava from a volcano has stopped flowing and is slowly cooling. the i... | openstax_college_physics_2e-web_7zesafu | [
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20. 0 w — half what you would calculate if the entire region behind him was hot. the rest of the surroundings are at. ( b ) discuss how this situation would change if the sunlit side of the tent was nearly pure white and if the rider was covered by a white tunic. 66. integrated concepts one day the relative humidity is... | openstax_college_physics_2e-web_7zesafu | [
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with the large cooling towers used by many large electrical power plants? 70. integrated concepts ( a ) suppose you start a workout on a stairmaster, producing power at the same rate as climbing 116 stairs per minute. assuming your mass is 76. 0 kg and your efficiency is, how long will it take for your body temperature... | openstax_college_physics_2e-web_7zesafu | [
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( b ) what fraction must evaporate to keep the temperature constant? 75. integrated concepts hot air rises because it has expanded. it then displaces a greater volume of cold air, which increases the buoyant force on it. ( a ) calculate the ratio of the buoyant force to the weight of air surrounded by air. ( b ) what e... | openstax_college_physics_2e-web_7zesafu | [
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1. 00 gal of gasoline is converted into “ waste heat ” in a car engine, how many kilograms of ice could it melt? ( b ) is this a reasonable amount of ice to carry around to cool the engine for 1. 00 gal of gasoline consumption? ( c ) what premises or assumptions are unreasonable? 78. unreasonable results ( a ) calculat... | openstax_college_physics_2e-web_7zesafu | [
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transfer and then decide how much physical activity of a chosen type is necessary to balance the rate of heat transfer. among the things to consider are the size of the person, type of clothing, initial metabolic rate, sky conditions, amount of water evaporated, and volume of air breathed. of course, there are many oth... | openstax_college_physics_2e-web_7zesafu | [
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