One solid sphere A and another hollow sphere B are of same mass and same outer radii. Their moment of inertia about their diameters are respectively IA and IB such that

1. IA=IB

2. IA>IB

3. IA<IB

4. IAIB=dAdB

Subtopic:  Moment of Inertia |
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A couple produces:                                                               [NTSE 1995; CBSE PMT 1997; DCE 2004]

1. Purely linear motion

2. Purely rotational motion

3. Linear and rotational motion

4. No motion

 

Subtopic:  Rotational Motion: Kinematics |
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A particle of mass 1 kg is kept at (1m, 1m, 1m). The moment of inertia of this particle about z-axis would be

1.  1 kg-m2

2.  2 kg-m2

3.  3 kg-m2

4.  None of these

Subtopic:  Moment of Inertia |
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One quarter sector is cut from a uniform circular disc of radius R.  This sector has mass M.  It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc.  Its moment of inertia about the axis of rotation is [IIT-JEE (Screening) 2001]

1. 12MR2

2. 14MR2

3. 18MR2

4. 2MR2

Subtopic:  Moment of Inertia |
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A wheel is rotating at the rate of 33 rev/min.  If it comes to stop in 20 s. Then, the angular retardation will be

1. πrads2                         

2. 11π rad/s2

3. π200 rad/s2             

4. 11π200 rad/s2

Subtopic:  Rotational Motion: Kinematics |
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A solid sphere is rotating about a diameter at an angular velocity ω.  If it cools so that its radius reduces to 1n of its  original value, its angular velocity becomes [MP PMT 2006]

1. ωn                                2. ωn2

3. nω                               4. n2ω

 

Subtopic:  Angular Momentum |
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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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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 |
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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. L23

2. L212

3. L3

4. L2

Subtopic:  Moment of Inertia |
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