a horizontalontal force of 200N is required to slide 15 kn block up a 20 incline with an acceleration of 25 cm/s2
The coefficient of friction between the block and the inclined surface is ( sin 20º = 0.34, cos20º = 0.94)
(A) 0.20
(D) 0.40
(C) 0.65
(B) 0.35
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Answer:
N= 200sin20°+15gcos20°
= 209
15gsin20°+uN<= 200cos20°
uN =137/209
= 0.65
(c)
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