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JAMB Physics 2020 Paper

Question : 32

Total: 38

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 $^{\circ}$ , then the value of W is

28.0N
48.0N
288.0N
50.0N

Validate

Solution:

V.E = 6, load = 120N

Efficiency = M.A x $rac{1}{V.R}$ x 100%

40 = $rac{120}{ ext{effort}}$ x $rac{1}{6}$ x $rac{100}{1}$

Effort = 50N

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