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A simple pendulum is vibrating with an a...

A simple pendulum is vibrating with an angular amplitude of `90^(@)` as shown in figure. For what value of `alpha` (angle between string and vertical) during its motion, the total acceleration is directed horizontally ?

A

`tan^(-1)((1)/(2))`

B

`tan^(-1)((1)/(sqrt(2)))`

C

`cos^(-1)(1//sqrt(3))`

D

`sin^(-2)(1//sqrt(3))`

Text Solution

Verified by Experts

The correct Answer is:
C
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