A cubical block of side l rests on a rough horizontal surface with coefficient of friction . A horizontal force f is applied from left to right. If the coefficient of friction is sufficiently high so that the block does not slide before toppling, the minimum force required to topple the block is
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Clearly, the block shall topple about its edge through O. The torque FL of the applied force is clockwise. The torque mg2L of the weight is anticlockwise.
Applying condition for rotational equilibrium.
−FL+mg2L=0 or F=2mg
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