Categories: Physics JAMB

The fiqure above 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 machine is 40%; then the value of W is

A. 28.0N
B. 48.0N
C. 288.0N
D. 50.0N

Correct Answer:

Option D = 50.0N

Explanation

V.E = 6, load = 120N

Efficiency = M.A x 1/V.R x 100%

40 = 120/effort x 1/6 x 100/1

Effort = 50N

 

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