Chapter 14: Q20Q (page 390)
A 22°C day is warm, while a swimming pool at 22°C feels cool. Why?
The rate of heat flow is more when you are in the pool. So, it feels cooler inside the pool than the land at the same temperature.
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(II)A 2.3-kg lead ball is placed in a 2.5-L insulated pail of water initially at 20.0°C. If the final temperature of the water–lead combination is 32.0°C, what was the initial temperature of the lead ball?
(a) If two objects of different temperatures are placed in contact, will heat naturally flow from the object with higher internal energy to the object with lower internal energy? (b) Is it possible for heat to flow even if the internal energies of the two objects are the same? Explain.
A 12-g lead bullet traveling at 220 m/s passes through a thin wall and emerges at a speed of 160 m/s. If the bullet absorbs 50% of the heat generated, (a) what will be the temperature rise of the bullet? (b) If the bullet’s initial temperature was 20°C, will any of the bullet melt, and if so, how much?
Microprocessor chips have a “heat sink” glued on top that looks like a series of fins. Why are they shaped like that?
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