A thin uniform circular disc of mass \(M\) and radius \(R\) is rotating in a horizontal plane about an axis passing through its center and perpendicular to its plane with an angular velocity ω. Another disc of the same dimensions but of mass \(\frac{1}{4}M\) is placed gently on the first disc co-axially. The angular velocity of the system will be:

1. 23ω 2. 45ω
3. 34ω 4. 13ω

Subtopic:  Angular Momentum |
 81%
From NCERT
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When a torque acting upon a system is zero, then which of the following will be constant 

1. force
2. Linear momentum
3. Angular momentum
4. Linear impulse



 

Subtopic:  Angular Momentum |
 86%
From NCERT
PMT - 1997
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Consider a system of two particles having masses \(m_1~\text{and}~m_2.\) If the particle of mass \(m_1\) is pushed towards the centre of mass of particles through a distance, by what distance would be the particle of the mass \(m_2\) move so as to keep the centre of mass of particles at the original position?
1. \(\frac{m_1}{m_1+m_2}d\)
2. \(\frac{m_1}{m_2}d\)
3. \(d\)
4. \(\frac{m_2}{m_1}d\)
Subtopic:  Center of Mass |
 56%
From NCERT
PMT - 2004
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A wheel whose moment of inertia is 12 Kgm2 has an initial angular velocity of 40 rad/sec. A constant torque of 20 Nm acts on the wheel. The time in which the wheel is accelerated to 100 rad/sec is

1.  72 seconds

2.  16 seconds

3.  8 seconds

4.  36 seconds

Subtopic:  Rotational Motion: Kinematics | Torque |
 82%
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A flywheel is in the form of a uniform circular disc of radius 1 m and mass 2 kg. The work which must be done on it to increase its frequency of rotation from 5 rev s-1 to 10 rev s-1 is approximately

1.  1.5 x 102 J

2.  3.0 x 102 J

3.  1.5 x 103 J

4.  3.0 x 103 J

Subtopic:  Rotational Motion: Kinematics |
 59%
From NCERT
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A constant torque acting on a uniform circular wheel changes its angular momentum from A0 to 4 A0 in 4s. The magnitude of this torque is 

1. 3A04

2. 4 A0

3. A0

4. 12 A0

Subtopic:  Angular Momentum |
 88%
From NCERT
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A body rolls down an inclined plane without slipping. The fraction of total energy associated with its rotation will be

1. K2+ R2
2. K2R2
3. K2K2+ R2
4. R2K2+ R2

Where k is radius of gyration of the body about an axis passing through centre of mass and R is the radius of the body. 

Subtopic:  Rolling Motion (OLD NCERT) |
 74%
From NCERT
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In the following figure, a weight W is attached to a string wrapped round a solid cylinder of mass M mounted on a frictionless horizontal axle at O.

If the weight starts from rest and falls a distance h, then its speed at that instant is

           

1. Proportional to \(\text R\)

2. Proportional to \(1 \over R\)

3. Proportional to \(1 \over R^2\)

4. Independent of \(\text R\)

Subtopic:  Torque |
 55%
From NCERT
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A solid cylinder rolls down an inclined plane that has friction sufficient to prevent sliding. The ratio of rotational energy to total kinetic energy is

1.  12

2.  13

3.  23

4.  34

 

Subtopic:  Rolling Motion (OLD NCERT) |
 70%
From NCERT
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A swimmer while jumping into water from a height easily forms a loop in the air, if

1. He pulls his arms and legs in
2. He spreads his arms and legs
3. He keeps himself straight
4. None of the above
Subtopic:  Moment of Inertia |
 78%
From NCERT
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