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Chapter 18: Q10P (page 541)
An aluminum flagpole 33 m ishigh. By how much does its length increase as the temperature increases by ?
The increase in length due to its temperature increase is 0.001m.
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The giant hornet Vespa mandarinia japonica preys on Japanese bees. However, if one of the hornets attempts to invade a beehive, several hundred of the bees quickly form a compact ball around the hornet to stop it. They don鈥檛 sting, bite, crush, or suffocate it. Rather they overheat it by quickly raising their body temperatures from thenormal,which is lethal to the hornet but not to the bees (Figure). Assume the following:bees form a ball ofradiusforatime,the primary loss of energy by the ball is by thermal radiation, the ball鈥檚 surface has emissivity,and the ball has a uniform temperature. On average, how much additional energy must each bee produce duringthe
tomaintain
?
A 0.530 kgsample of liquid water and a sample of ice are placed in a thermally insulated container. The container also contains a device that transfers energy as heat from the liquid water to the ice at a constant rate P, until thermal equilibrium is reached. The temperatures Tof the liquid water and the ice are given in Figure as functions of time t; the horizontal scale is set by(a) What is rate P? (b) What is the initial mass of the ice in the container? (c) When thermal equilibrium is reached, what is the mass of the ice produced in this process?
Question: A gas thermometer is constructed of two gas-containing bulbs, each in a water bath, as shown in Figure. The pressure difference between the two bulbs is measured by a mercury manometer as shown. Appropriate reservoirs, not shown in the diagram, maintain constant gas volume in the two bulbs. There is no difference in pressure when both baths are at the triple point of water. The pressure difference is 120 torr when one bath is at the triple point and the other is at the boiling point of water. It is 90.0 torrwhen one bath is at the triple point and the other is at an unknown temperature to be measured. What is the unknown temperature?
An insulated Thermos contains of hot coffee at.You put in aice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and neglect energy exchanges with the environment.
A lab sample of gas is taken through cycle abca shown in the p-V diagram of Figure. The net work done is +1.2 J. Along path ab, the change in the internal energy is +3.0 Jand the magnitude of the work done is 5.0 J. Along path ca, the energy transferred to the gas as heat is +2.5 J.
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