The diagram above is a block and tackle pulley system in which an effort of…

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 Answer: Option B
Explanation

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

∴ efficiency = M.A
x 100
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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