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Chapter 3: Q9DQ (page 573)
A student asserts that a suitable unit for specific heat is . Is she correct? Why or why not?
The student asserts that a suitable unit for specific heat is . She is correct.
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What would be the efficiency of a Carnot engine operating with ? What would be the efficiency if and were any temperature above 0K? Interpret your answers.
A cylindrical tank has a tight-fitting piston that allows the volume of the tank to be changed. The tank originally contains 0.110 m3of air at a pressure of 0.355 atm. The piston is slowly pulled out until the volume of the gas is increased to 0.390 m3. If the temperature remains constant, what is the final value of the pressure?
A newspaper article about the weather states that 鈥渢he temperature of a body measures how much heat the body contains.鈥� Is this description correct? Why or why not?
An ideal gas expands while the pressure is kept constant. During this process, does heat flow into the gas or out of the gas? Justify your answer.
When you use a hand pump to inflate the tires of your bicycle, the pump gets warm after a while. Why? What happens to the temperature of the air in the pump as you compress it? Why does this happen? When you raise the pump handle to draw outside air into the pump, what happens to the temperature of the air taken in? Again, why does this happen?
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