Asked by  | 3rd Mar, 2012, 03:01: PM

Expert Answer:

When you pump up a cycle tyre with a hand pump, that the end of the pump gets hot because the energy that is put into the air by pumping it has not only compressed it, but has also caused the air molecules to push closer together so giving off heat with the friction.

Answered by  | 9th Mar, 2012, 09:53: AM

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