The diagram above is a block and tackle pulley system in ...
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
60%
50%
40%
33%
Correct answer is B
Since the number of pulleys present is 6, it implies that the velocity ratio VR = 6
∴ efficiency = | M.A |
| |||
V.R |
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