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a simple pendulum with a bob of mass m s...

a simple pendulum with a bob of mass m savings with an angular amplitude of `40^(@)`. When its angular displacement is `20^(@)`, the tension in the strings is-

A

less than mg cos `20^(@)`

B

greater than mg cos `20^(@)`

C

equal to mg cos `20^(@)`

D

unpredictable

Text Solution

Verified by Experts

The correct Answer is:
2
`T-mgcos20=(mv^(2))/R`
`T=mgcos20+(mv^(2))/R`
i.e. T`gt`mgcos20
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