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Chapter 19: Q. 12 (page 543)
How much heat energy must be added to a 6.0-cm-diameter copper sphere to raise its temperature from -50°C to 150°C?
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The volume of a gas is halved during an adiabatic compression
that increases the pressure by a factor of 2.5.
a. What is the specific heat ratio?
b. By what factor does the temperature increase?
A gas is compressed from 600 cm3 to 200 cm3 at a constant pressure of 400 kPa. At the same time, 100 J of heat energy is transferred out of the gas. What is the change in thermal energy of the gas during this process?
Do (a) temperature, (b) heat, and (c) thermal energy describe a property of a system, an interaction of the system with its environment, or both? Explain.
One way you keep from overheating is by perspiring.
Evaporation—a phase change—requires heat, and the heat energy
is removed from your body. Evaporation is much like boiling,
only water’s heat of vaporization at is a somewhat larger
Because at lower temperatures, more energy is required.
to break the molecular bonds. Very strenuous activity can
This causes an adult human to produce 30 g of perspiration per minute.
If all the perspiration evaporates, rather than drips off, at what
rate (in J/s) is it possible to exhaust heat by perspiring?
The ends of a 20-cm-long, 2.0-cm-diameter rod are maintained at and by immersion in an ice-water bath and boiling water. Heat is conducted through the rod at 4.5 * 104 J per hour. Of what material is the rod made?
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