COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 14, Problem 46QAP
To determine
The temperature increases of the room during the hour-long test, if 100 physics students each give off 100 W as they sit in the classroom taking an exam. Assume that 1 % of the heat goes into raising the air temperature
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Chapter 14 Solutions
COLLEGE PHYSICS
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- A pronghorn antelope can run at a remarkable 18 m/sm/s for up to 10 minutes, almost triple the speed that an elite human runner can maintain. For a 32 kgkg pronghorn, this requires an astonishing 3.4 kWkW of metabolic power, which leads to a significant increase in body temperature. If the pronghorn had no way to exhaust heat to the environment, by how much would its body temperature increase during this run? (In fact, it will lose some heat, so the rise won't be this dramatic, but it will be quite noticeable, requiring adaptations that keep the pronghorn's brain cooler than its body in such circumstances.) Assume the efficiency of the pronghorn to be equal to that of human.arrow_forward800 J of work are done BY a system in a process that decreases the thermal energy of the system by 50 J. How much heat is transferred TO the system during this process? If the system gains heat, answer with a positive number. If the system loses heat, answer with a negative number. (in J) -750 750 -850 -50 0arrow_forwardTwo finned surfaces are identical, except that the convection heat transfer coefficient of one of them is twice that of the other. For which finned surface is the (a) fin effectiveness and (b) fin efficiency higher? Explain.arrow_forward
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- The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system. How much heat, in joules, is transferred into a system when its internal energy decreases by 165 J while it was performing 27.5 J of work?arrow_forwardThe tea in a cup of tea has a temperature of 50 degree celsius and a certain internal energy. If all of a sudden you pour half of the water onto the floor, does the temperature of the tea in the cup change? and the internal energy?. EXPLAINarrow_forwardConsider the thermodynamic process, A->B->C->A shown above. The heat absorbed during A->B is 591J. If the change in internal energy during B->C is 4146J, What is the change in internal energy in SI units during C->A? Express only the number of your answer with 4 significant figures.arrow_forward
- The ground temperature a few meters below the surface is fairly constant throughout the year and is near the average value of the air temperature. In areas in which the air temperature drops very low in the winter, the exterior unit of a heat pump designed for heating is sometimes buried underground in order to use the earth as a thermal reservoir. Why is it worthwhile to bury the heat exchanger, even if the underground unit costs more to purchaseand install than one above ground?arrow_forwardWhile painting the top of an antenna 225m in height, you accidentally let a1.00-L water bottle fall from your lunchbox. The bottle lands in some bushes at ground level and does not break. If a quantity of heat equal to the magnitude of the change in mechanical energy of the water goes into the water, what is the increase in temperature?arrow_forwardWhat is the maximum efficiency of a heat engine operating between 68oF and 273 kelvins, the temperatures at the surface and several hundred meters below the surface, respectively, of the ocean?arrow_forward
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