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A simple pendulum of length I and mass (...

A simple pendulum of length I and mass (bob) m is suspended vertically. The string makes an angle `theta` with the vertical. The restoring force acting on the pendulum is

A

`mv^(2)//L`

B

`mgcostheta+mv^(2)//L`

C

`mgcostheta-mv^(2)//L`

D

`mgcostheta`

Text Solution

Verified by Experts

The correct Answer is:
B

The necessary centripetal force is provided by
`T-mgcostheta=(mv^(2))/(r)`
`T=mg cos theta+(mv^(2))/(L)`
[`because Tto`Tension]
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