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Chapter 19: Q. 15 (page 543)
How much heat is needed to change 20 g of mercury at
into mercury vapor at the boiling point?
The answer is
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What maximum power can be radiated by a 10-cm-diameter solid lead sphere? Assume an emissivity of 1.
A 750 g aluminum pan is removed from the stove and plunged
into a sink filled with 10.0 L of water at 20.0 C. The water temperature
quickly rises to 24.0 C. What was the initial temperature
of the pan in C and in F?
A cube on each side contains of helium at . of heat energy are transferred to this gas. What are (a) the final pressure if the process is at constant volume and (b) the final volume if the process is at constant pressure? (c) Show and label both processes on a single diagram.
How much heat energy must be added to a 6.0-cm-diameter copper sphere to raise its temperature from -50掳C to 150掳C?
Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. If the body鈥檚 surface temperature is 35掳C, what is the net rate of heat loss on a chilly 5掳C day? All skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95.
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