The Unit of angular momentum is
 

Important Questions on Rotational Motion

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Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 182

A uniform stick of length$l$ and mass $m$ lies on a smooth table. It rotates with angular velocity $\omega$ about an axis perpendicular to the table and through one end of the stick. The angular momentum of the stick about the end is

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Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 183

The angular speed of a body changes from ${\omega }_1$ to ${\omega }_2$ without applying a torque due to change in moment of inertia. The ratio of the radii of gyration in the two cases is

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Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 184

A swimmer while jumping into water from a height easily forms a loop in air, if

MEDIUM

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 185

A dancer is standing on a stool rotating about the vertical axis passing through its centre. She pulls her arms towards the body reducing her moment of inertia by a factor of $n$. The new angular speed of turn table is proportional to,

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Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 186

A mass is whirled in a circular path with a constant angular velocity and its angular momentum is $L$. If the string is now halved keeping the angular velocity same, the angular momentum is,
 

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Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 187

A wheel is rotating freely at an angular speed of $800 \mathrm{rev} {\min }^{-1}$ On a shaft whose rotational inertia is negligible. A second wheel initially at rest with thrice the rotational inertia of the first is suddenly coupled to the same shaft. The fraction of original kinetic energy lost is,
 

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Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 188

A wheel rotates with angular velocity $500 \mathrm{rpm}$ On a shaft. Second identical wheel axially at rest is suddenly coupled on same shaft. What is the total angular speed of the system? [Assume M.I. of shaft to be negligible.]

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Physics Crash Course MHT-CET>Chapter 4 - Rotational Motion>Exercise 1>Q 189

If the radius of the earth contracts to half of its present value keeping mass constant, then the length of the day will be,