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Question

An effort of 240 N overcome a useful load 1000 N when applied to a block and system of pulleys, such that the weight movable block and friction is 200 N.
Calculate the efficiency of the system (to the nearest integer).
 



A

83%

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B

89%

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C

91%

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D

79%

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Solution

The correct option is A

83%


Given: Load = 1000 N, effort = 240 N and friction = 200 N

Mechanical advantage =LoadEffort=1000240=4.17

Velocity ratio = Ideal mechanical advantage
=Resistance overcomeEffort
=Useful load + other forceEffort
=1000+200240=1200240=5

Efficiency =MAVR×100=4.165×100=83.2%83


Physics

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