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A 400 lb block is resting on a rough horizontal surface for the coefficient of friction is o.40. determine the force P required to cause motion to impend if applied to the block (A) horizontally or (B) downward at 30 degree with the horizontal

1. A \( 400 \mathrm{lb} \) block is resting on a rough horizontal surface for which the coefficient of summation of all forces vertical equate to zero \( E f v=0 \) friction is \( 0.40 \). Determine the force \( P \) required to cause motion to impend if applied to the block (a) horizontally or (b) downward at \( 30^{\circ} \) with the horizontal. MOVE \( N \) TO THE OTHERSIDE OF EQUATION \( \mathrm{W}=\mathrm{N} \) WEIGHT IS EQUALTO 400 \( N=400 \mid \) USE FRICTION FORMULANG \( F=f N \) \( \mathrm{f}=.4 \mathrm{~N}=400 \) \( F=.4(400) \) \( F=160 \) SUMMATION OF FORCES HORIZONTAL EQUATE TO ZERO EFh=0 \( \mathrm{P}-\mathrm{F}=0 \) MOVE F TO THE OTHER SIDE OF EQUAL SIGN TO MAKE IT POSITIVE F IS EQUAL TO 160 \[ P=160 \]

Given weight of the block W or N = 400KN c