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An agent applies force of constant magni...

An agent applies force of constant magnitude `F_(0)` always in the tangential direction as shown in the figure`-3.77`. Find the speed of the bob when string becomes horizontal, assuming that it is at rest at its lowest point:

A

`sqrt((l)/(m) (pi F_(0) - 2 mg))`

B

`sqrt(lg)`

C

`sqrt((l)/(m) (pi F_(0)) - 4 gm)`

D

`sqrt((l)/(m) F_(0))`

Text Solution

Verified by Experts

The correct Answer is:
A
`W = Delta KE`
`- mgl + F_(0) xx l (pi)/(2) = (1)/(2) mv^(2) - 0`
`sqrt(-2gl + (F_(0)pi1)/(m)) = v`
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