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#28-Vertical-Non-Uniform-Circular-Motion-2

(Physics) > Laws of Motion

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Related Practice Questions :

Let $\theta $ denote the angular displacement of a simple pendulum oscillating in a vertical plane. If the mass of bob is m. The tension in the string is mg cos $\theta $

1. always

2. never

3. at extreme

4. at mean position

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A particle is moving in a vertical circle. The tension in the string when passing through two positions at anele of 30$\xb0$ and 60$\xb0$ from vertical (the lowest position) are ${\mathrm{T}}_{1}\mathrm{and}{\mathrm{T}}_{2}$ respectively, then:

1. ${\mathrm{T}}_{1}={\mathrm{T}}_{2}$

2. ${\mathrm{T}}_{2}{\mathrm{T}}_{1}$

3. ${\mathrm{T}}_{2}{\mathrm{T}}_{1}$

4. Tension in the string always remains the same.

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What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?

(a)$\sqrt{2\mathrm{gR}}$

(b)$\sqrt{3gR}$

(c)$\sqrt{5gR}$

(d)$\sqrt{gR}$

NEET - 2016

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A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill is between

1. 14m/s and 15m/s

2. 15m/s and 16m/s

3. 16m/s and 17m/s

4. 13m/s and 14m/s

NEET - 2008

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