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A 2.60 kg block is initially at rest on a horizontal surface. A horizontal force ModifyingAbove...

A 2.60 kg block is initially at rest on a horizontal surface. A horizontal force ModifyingAbove Upper F With right-arrow of magnitude 6.59 N and a vertical force ModifyingAbove Upper P With right-arrow are then applied to the block (see the figure). The coefficients of friction for the block and surface are ?s = 0.4 and ?k = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of ModifyingAbove Upper P With right-arrow is (a)8.00 N and (b)11.0 N. (The upward pull is insufficient to move the block vertically.)

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