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A block placed on a horizontal surface i...

A block placed on a horizontal surface is being pushed by a force F making an angle `theta` with the vertical as shown in Fig. 7.39 . The coefficient of friction between block and surface is `mu` . (a) Find the force required to slide the block with uniform velocity on the floor . (b) Show that if `theta` is smaller than a certain

angle `theta_(0)` , the block cannot be made to slide across the floor , no matter how great the force be .

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