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  4. A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 s is V = 4.2 J/cal and g=9.8 m/s2 )

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Q. A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 s is V = 4.2 J/cal and $ g=9.8\,m/{{s}^{2}} $ )

Rajasthan PMTRajasthan PMT 2010

Solution:

Work done = Force $ \times $ Displacement $ W=\mu \,\,mg\times (v\times t) $ $ W=(0.2)\times 2\times 9.8\times 2\times 5 $ $ W=39.2\,\,J $ Heat generated, $ Q=\frac{W}{J} $ $ =\frac{39.2}{4.2} $ $ =9.33\,\,cal $