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Question

A block and tackle system have VR = 5. Rohan exerts a pull of 150 kgf. What is the maximum load he can raise with his pulley system if its efficiency = 75%?


A

5000 N

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B

5500 N

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C

5600 N

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D

5625 N

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Solution

The correct option is D

5625 N


A block and tackle system of VR = 5 is as shown below.

Given: VR = 5, L = ?
E = 150 kgf
= 150 × 10 = 1500 N
η=75100=34=MAVR
MA=154=LE
or L = 5625 N


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