fig 4 represents a block-and-tackle pulley system on whic...
fig 4 represents a block-and-tackle pulley system on which an effort of W newtons supports a load of 120.0N if the efficiency of the system is 40% then the value of W is
28.0N
48.0N
50.0N
288.0N
Correct answer is C
Efficiency = fracM.A×100V.R
V.R = 6
40= fracM.A×1006
M.A = frac6×40100
M.a=2.4
M.A= frac{L}{E
E= frac{120}{2.4
E= 50
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