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A rod of length 2 m and mass 0.5 kg is f...

A rod of length 2 m and mass 0.5 kg is fixed at one end and allowed to hang vertically from a rigid support. Find the work done in raising the other end of the rod until it makes an angle of `60^(@)` with the vertical. `(g=10 ms^(-2))`

Text Solution

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`m = 0.5 kg, l = 2m, theta = 60^(@)` Work done W = mg `(l)/(2) (1-cos theta)`
= `0.5 xx 10 xx (2)/(2) (1 - cos 60^(@))`
`=5xx(1-(1)/(2))=5xx(1)/(2)=2.5j`
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