A man is sitting on a rotating table with his arms stretched outwards.  When he suddenly folds his arms inside, then

(1) his angular velocity will decrease

(2) his angular velocity remains constant

(3) his moment of inertia decreases

(4) angular momentum increases

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A body of mass M and radius R is rolling horizontally without slipping with speed v.  It then rolls up a hill to a maximum height h.  If $h=\frac{5{v}^{2}}{6g}$, what is the M.I of the body?

(1) $\frac{M{R}^{2}}{2}$                   (2)

(3)                 (4)

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One projectile moving with velocity v in space, gets burst into 2 parts of masses in the ratio 1:3.  The smaller part becomes stationary.  What is the velocity of the other part?

(1) 4v                        (2) v

(3) $\frac{4v}{3}$                     (4) $\frac{3v}{4}$

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One circular ring and one circular disc both having the same mass and radius. The ratio of their moments of inertia about the axes passing through their centres and perpendicular to planes will be

1. 1:1

2. 2:1

3. 1:2

4. 4:1

Concept Questions :-

Moment of inertia
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A wheel of radius R rolls on the ground with a uniform velocity v. The velocity of topmost point relative to the bottommost point is

1. v

2. 2v

3. v/2

4. zero

Concept Questions :-

Rolling motion
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The figure shows a uniform solid block of mass M and edge lengths a, b and c. Its M.O.I. about an axis through one edge and perpendicular (as shown) to the large face of the block is

1. $\frac{M}{3}\left({a}^{2}+{b}^{2}\right)$

2. $\frac{M}{4}\left({a}^{2}+{b}^{2}\right)$

3. $\frac{7M}{12}\left({a}^{2}+{b}^{2}\right)$

4. $\frac{M}{12}\left({a}^{2}+{b}^{2}\right)$

Concept Questions :-

Moment of inertia
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The moment of inertia of a cube of mass m and side a about one of its edges is equal to

(1)                 (2)

(3)                   (4)

Concept Questions :-

Moment of inertia
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If the net external forces acting on the system of particles is zero, then which of the following may vary ?

1. Momentum of the system

2. Velocity of centre of mass

3. Position of centre of mass

4. None of the above

Concept Questions :-

Center of mass
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A constant torque of 1000 N-m turns a wheel of moment of inertial 200 $\mathrm{kg}-{\mathrm{m}}^{2}$ about an axis through its centre. Its angular velocity after 3 s is

Concept Questions :-

Rotation motion : Introduction
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Point masses ${\mathrm{m}}_{1}$ and ${\mathrm{m}}_{2}$ are placed at the opposite ends of a rigid of length L and negligible mass. The rod is to be set rotating about an axis perpendicular to it. The position of point P on this rod through which the axis should pass so that the work required to set the rod rotating with angular velocity ${\mathrm{\omega }}_{0}$ is minimum is given by

Concept Questions :-

Moment of inertia