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Question

A man uses a crowbar of length 1.5m to raise a load of 75kgf by putting a sharp edge below the bar at a distance 1m from his hand. Calculate the mechanical advantage.

A
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B
1
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C
2
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D
4
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Solution

The correct option is A 2
Load =75kgf
Length of crowbar =1.5m
Effort arm =1m
So, Load Arm =Length of crowbar - Effort arm

1.51=0.5m
Mechanical Advantage =Effort ArmLoad Arm=10.5=2

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