# A solid sphere is rotating about a diameter at an angular velocity $\omega$.  If it cools so that its radius reduces to $\frac{1}{n}$ of its  original value, its angular velocity becomes [MP PMT 2006] 1. $\frac{\omega }{n}$                                2. $\frac{\omega }{{n}^{2}}$ 3. $n\omega$                               4. ${n}^{2}\omega$

Subtopic:  Angular Momentum |
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PMT - 2006
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A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass 'm' is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period

1. Decreases continuously

2. Decreases initially and increases again

3. Remains unaltered

4. Increases continuously

Subtopic:  Angular Momentum |
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AIIMS - 2005
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For L = 3.0 m, the total torque about pivot A provided by the forces as shown in the figure is:

 1 210 Nm 2 140 Nm 3 95 Nm 4 75 Nm
Subtopic:  Torque |
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For the same total mass, which of the following will have the largest moment of inertia about an axis passing through the centre of gravity and perpendicular to the plane of the body?

1. A disc of radius a

2. a ring of radius a

3. a square lamina of side 2 a

4. four rods forming square of side 2 a.

Subtopic:  Moment of Inertia |
From NCERT
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The radius of gyration of a uniform rod of length L about an axis passing through its centre of mass is

1. $\frac{L}{2\sqrt{3}}$

2. $\frac{{L}^{2}}{12}$

3. $\frac{L}{\sqrt{3}}$

4. $\frac{L}{\sqrt{2}}$

Subtopic:  Moment of Inertia |
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Two uniform, thin, identical rods, each of mass M and length l are joined together to form a cross. What will be the moment of inertia of the cross about an axis passing through the point at which the two rods are joined and are perpendicular to the plane of the cross?

1. $\frac{M{l}^{2}}{12}$

2. $\frac{M{l}^{2}}{6}$

3. $\frac{M{l}^{2}}{4}$

4. $\frac{M{l}^{2}}{3}$

Subtopic:  Moment of Inertia |
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If the linear momentum is increased by 50%, the kinetic energy will increase by

1.  50%

2.  100%

3.  125%

4.  25%

Subtopic:  Linear Momentum |
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If the kinetic energy of a body increases by 0.1%, the percent increase of its momentum will be

1.  0.05%

2.  0.1%

3.  1.0%

4.  10%

Subtopic:  Linear Momentum |
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A solid cylinder and a hollow cylinder, both of the same mass and same external diameter are released from the same height at the same time on an inclined plane. Both roll down without slipping. Which one will reach the bottom first?

1.  Both together only when the angle of inclination of the plane is ${45}^{0}$

2.  Both together

3.  Hollow cylinder

4.  Solid cylinder

Subtopic:  Rolling Motion (OLD NCERT) |
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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

Subtopic:  Moment of Inertia |
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