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Ram used a crowbar of length 1.5 m as a ...

Ram used a crowbar of length 1.5 m as a `II^(nd)` order lever to displace a heavy sphere placed on the horizonat surface. If the crowbar applies a force of 240 N on the sphere at a distance of 100 cm from effort, then find the minimum effort applied by Ram to displace it.

Text Solution

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The correct Answer is:
80N
Crowbar act as IInd order lever as shown below :

To apply minimum effort, effort, should be applied at the top of the crowbar as shown in the figure, then
Effort arm = Length of the crowbar = 1. 5 m = 150 cm Load arm = 150 cm - 100 cm = 50 cm
`MA = ("Effort arm ")/("Load arm ") = (150)/(50) = 3`
`E = (L)/(MA) = (240)/(3) = 80`
Minimum effort = 80 N
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