1.

A simple pendulum of length has a maximum angular displacement theta. The maximum kinetic energy of the bob of masss m will be :

Answer»

`mg(1-cos theta)`
2mgl
`mgl cos theta`
mgl.

Solution :When bob is displaced through ANGLE `theta` then height gained by bob is h.

`:.""cos theta=(OC)/(OB)=(l-h)/(l)=1-(h)/(l)`
`(h)/(l)=1-cos thetaimpliesh=(l-cos theta)`
`:.` P.E. of bob at extreme position `="mgl"(1-cos theta)`.
Correct choice is ( c )


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