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A uniform rod of mass m is initially rotated about a vertical axis passing through its C.M. such that speed of both ends is v in opposite direction and placed gently on a rough horizontal surface. If coefficient of friction between rod and surface is u then rate of loss of kinetic energy just after the rod placed on surface is -(1) μmgev(2) μmgy(3) μmg(4) 2μmg |
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Answer» The correct option is (3) μmg. Given: Block of mass is 'm' Coefficient of friction ' μ' We have to apply a force that is just greater than static friction force on a body. So the required force is F = μ.N = μ mg. |
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