A wheel is at rest. Its angular velocity increases uniformly and becomes 80 rad/s after 5 s. The total angular displacement is 

1. 800 rad

2. 400 rad

3. 200 rad

4. 100 rad

Subtopic:  Rotational Motion: Kinematics |
 70%
From NCERT
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A force\(- F \hat k\) acts on O, the origin of the coordinate system. The torque at the point (1, -1) will be:

1. -Fi^+j^

2. Fi^+j^

3. -Fi^-j^

4. Fi^-j^

Subtopic:  Torque |
From NCERT
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Moment of inertia of an object does not depend upon

1.  mass of object

2.  mass distribution

3.  angular velocity

4.  axis of rotation

Subtopic:  Moment of Inertia |
 79%
From NCERT
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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 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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Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc D1 has 2 kg mass and 0.2 m radius and initial angular velocity of 50 rad s-1. Disc D2 has 4 kg mass, 0.1 m radius and initial angular velocity of 200 rad s-1. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad.s-1) of the system is

1. 60

2. 100

3. 120

4. 40

Subtopic:  Angular Momentum |
 74%
From NCERT
NEET - 2013
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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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