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Chapter 3: Q6DQ (page 573)
Why is it sometimes possible to loosen caps on screw-top bottles by dipping the capped bottle briefly into hot water?
Due to the difference in volume expansion, the caps get to loosen up.
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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?
In an adiabatic process for an ideal gas, the pressure decreases. In this process does the internal energy of the gas increase or decrease? Explain.
In deriving the ideal-gas equation from the kinetic molecular model, we ignored potential energy due to the earth’s gravity. Is this omission justified? Why or why not?
A diesel engine performs 2200 J of mechanical work and discards 4300 J of heat each cycle. (a) How much heat must be supplied to the engine in each cycle? (b) What is the thermal efficiency of the engine?
It is well known that a potato bakes faster if a large nail is suck through it .Why? Does an Aluminium nail work better than a steel one? Why or why not? There is also a gadget on the market to hasten the roasting meat; it consists of a hollow metal tube containing a wick and some water. This is claimed to work much better than a solid metal rod. How does it work?
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