A particle is tied to 20,cm long string. It performs circular motion in vertical plane. angular velo

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5.Work, Energy, Power and Collision

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A particle is tied to $20\,cm$ long string. It performs circular motion in vertical plane. What is the angular velocity of string when the tension in the string at the top is zero .......... $rad/sec$

A

$5$

B

$2$

C

$7.5$

D

$7$

Solution

(d)$\omega = \sqrt {\frac{g}{r}} = \sqrt {\frac{{9.8}}{{0.2}}} = 7\,rad/s$

Standard 11

Physics

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