Questions

A simple pendulum crosses the highest point of a vertical circle with critical speed. What will be the centripetal acceleration of the bob, when the string is horizontal?

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2 g

3 g

2.5 g

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detailed solution

Correct option is C

if it is critical velocity then at the lowest point it is 5gl at the horizontal position it will be 3gl from conservation of energy 12mv20=12mv2+ mgl ⇒12m5gl-mgl = 32mgl =12mv2 centrepetal acceleration v2l= 3g

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