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Chapter 3: Q27DQ (page 573)
We鈥檙e lucky that the earth isn鈥檛 in thermal equilibrium with the sun (which has a surface temperature of .But why aren鈥檛 the two bodies in thermal equilibrium?
Earth and sun are not in equilibrium because they don鈥檛 form an isolated system.
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Q18.26: A beaker of water at room temperature is placed in an enclosure, and the air pressure in the enclosure is slowly reduced. When the air pressure is reduced sufficiently, the water begins to boil. The temperature of the water does not rise when it boils; in fact, the temperature drops slightly. Explain these phenomena.
Unwrapped food placed in a freezer experiences dehydration, known as 鈥渇reezer burn.鈥� Why?
A thermodynamic system undergoes a cyclic process as shown in Fig. Q19.24. The cycle consists of two closed loops: I and II. (a) Over one complete cycle, does the system do positive or negative work? (b) In each loop, is the net work done by the system positive or negative? (c) Over one complete cycle, does heat flow into or out of the system? (d) In each loop, does heat flow into or out of the system? Explain
In the carburetor of an aircraft or automobile engine, air flows through a relatively small aperture and then expands. In cool, foggy weather, ice sometimes forms in this aperture even though the outside air temperature is above freezing. Why?
Explain why it would not make sense to use a full-size glass thermometer to measure the temperature of a thimbleful of hot water.
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