Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Digestingfat produces 9.3 food calories per gram of fat, and typically 80%of this energy goes to heat when metabolized. (One food calorie is1000 calories and therefore equals 4186 J.) The body then movesall this heat to the surface by a combination of thermal conductivityand motion of the blood. The internal temperature of the body(where digestion occurs) is normally 37C, and the surface is usuallyabout 30C. By how much do the digestion and metabolism of a2.50 g pat of butter change your body’s entropy? Does it increase ordecrease?
If the air temperature isthe same as the temperature of your skin (about 30°C), your body cannotget rid of heat by transferring it to the air. In that case, it gets ridof the heat by evaporating water (sweat). During bicycling, a typical70 kg person’s body produces energy at a rate of about 500 W due tometabolism, 80% of which is converted to heat. (a) How many kilogramsof water must the person’s body evaporate in an hour to get ridof this heat? The heat of vaporization of water at body temperature is2.42 * 10^6 J/kg. (b) The evaporated water must, of course, be replenished,or the person will dehydrate. How many 750 mL bottles of watermust the bicyclist drink per hour to replenish the lost water? (Recall thatthe mass of a liter of water is 1.0 kg.)
Two objects are made of the same material, but they havedifferent masses and temperatures. If the objects are broughtinto thermal contact, which one will have the greater temperature change?(a) The one with the higher initial temperature.(b) The one with the lower initial temperature.(c) The one with the greater mass.(d) The one with the lesser mass.(e) The one with the higher specific heat.(f) Not enough information
Chapter 18 Solutions
Physics for Scientists and Engineers
Ch. 18 - Prob. 1PCh. 18 - Prob. 2PCh. 18 - Prob. 3PCh. 18 - Prob. 4PCh. 18 - Prob. 5PCh. 18 - Prob. 6PCh. 18 - Prob. 7PCh. 18 - Prob. 8PCh. 18 - Prob. 9PCh. 18 - Prob. 10P
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- The specific heat of substance A is greater than that of substance B. Both A and B are at the same initial temperature when equal amounts of energy are added to them. Assuming no melting or vaporization occurs, which of the following can be concluded about the final temperature TA of substance A and the final temperature TB of substance B? (a) TA TB (b) TA TB (c) TA = TB (d) More information is needed.arrow_forwardThe height of the Washington Monument is measured to be 170.00 m on a day when the temperature is 35.0 . What will its height be on a day when the temperature falls to -10.0 ? Although the monument is made of limestone, assume that its coefficient of thermal expansion is the same as that of marble. Give your answer to five significant figures.arrow_forwardIn a calorimetry experiment, two liquid substances X and Y with the same mass are placed in separate isolated containers. The specific heat of the substances are related by c x = 2cy. If the substances receive the same amount of heat, what will be the relationship between the change in temperature, ATx and ATy? O ATX = 2ATY O 2ATX = ATy O ATX = ATy Ο ΔΤ- 4ΔΤΥarrow_forward
- In a calorimetry experiment, two liquid substances X and Y with the same mass are placed in separate isolated containers. The specific heat of the substances are related by cx 2cy. If the substances receive the same amount of heat, what will be the relationship between the change in temperature, ATx and ATy? Ο ΔΤΧ ΔΙΥ O ATX Ο ΔΤ - 2ΔΤ, ATX O 2ATX ATY Ο ΔΤΧ- 4ΔΤΥ O ATX 4ATYarrow_forwardIn a calorimetry experiment, two liquid substances X and Y with the same mass are placed in separate isolated containers. The specific heat of the substances are related by cx = 2cy. If the substances receive the same amount of heat, what will be the relationship between the change in temperature, ATx and ATy? Ο ΔΤ2ΔΤΥ Ο ΔΤ ΔΤΥ 2ATX ATY ATx = 4ATYarrow_forwarda sphere emissivity = 0.42 of radius 25 cm is at 27 degrees celsius is placed in a room with a temperature of 2 degrees celsius A. what is the rate of heat energy enterinh the sphere B. How long will it take for the spiritual as 1 x 10^6 joules of energy?arrow_forward
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