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Question

A metal block of mass 100 kg is dragged on a rough horizontal surface with a constant speed of 5 ms1. If the coefficient of kinetic friction between the block and the road is 0.4. Find the rate of generation of heat in S.I. unit.

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Solution

Loss of energy per unit time =work done by frictional force in a unit time
Heat generated =μmgv
=0.4×100×10×5
=2000
=2kJ

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