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Standard IX

Physics

Acceleration

A particle is...

Question

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

5

rad / sec

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2

rad / sec

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7.5

rad / sec

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7

rad / sec

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Solution

The correct option is D $7$ rad / sec
$\begin{matrix} m r w^{2} = m g w = \sqrt{\frac{g}{r}} = \sqrt{\frac{9.8}{0.2}} = 7 r a d / sec \end{matrix}$
Hence,
option $(D)$ is correct answer.

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Similar questions

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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

The correct option is D 7 rad / secmrw2=mgw=√gr=√9.80.2=7rad/secHence,option (D) is correct answer.

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

The correct option is D $7$ rad / sec
$\begin{matrix} m r w^{2} = m g w = \sqrt{\frac{g}{r}} = \sqrt{\frac{9.8}{0.2}} = 7 r a d / sec \end{matrix}$
Hence,
option $(D)$ is correct answer.