The force P is applied to the 50-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 200 N, and (c) P = 250 N. (d) What value of P is required to initiate motion up the incline? The coefficients of static and kinetic friction %3D %3D %3D between the block and the incline are µ, = 0.25 and %3D Hi = 0.20, respectively. %3D 50 kg 20° H = 0.25 Hk = 0.20 15°

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