A cycle pump becomes hot near the nozzle after a few quick strokes even if they are smooth because
A
the volume of air decreases
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B
the number of air molecules increase
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C
the compression is adiabatic
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D
collision between air particles increases
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Solution
The correct option is D the compression is adiabatic The compression that occurs is sudden and adiabatic. To compensate for the compression of the gas (negative work). The internal energy must increase, hence the increase in temperature. Option C is correct.