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The diagram above is a block and tackle pulley ... - JAMB Physics 2001 Question

The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is
A
60%
B
50%
C
40%
D
33%
correct option: b

Since the number of pulleys present is 6, it implies that the velocity ratio VR = 6

∴ efficiency = M.A
x100
1

V.R

= Load/Effort x 1/V.R x 100/1

= 240/80 x 1/6 x 100/1

= 50%

∴ Efficiency = 50%

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