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A 1.680 kg block of wood rests on a steel desk. The coefficient of static friction...

A 1.680 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is μs = 0.555 and the coefficient of kinetic friction is μk = 0.205. At time t = 0, a force F = 5.63 N is applied horizontally to the block. State the force of friction applied to the block by the table at the following times:

T=0              T>0

Consider the same situation, but this time the external force F is 11.3 N. Again state the force of friction acting on the block at the following times:

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