A uniform rod AB of length l and mass m is free to rotate about point A. The rod is released from rest in horizontal position. Given that the moment of inerita of the rod about A is ml23 the initial angular acceleration of the rod will be

 

1. 2g3l
2. mgl2
3. 32gl
4. 3g2l

Subtopic:  Torque |
 72%
From NCERT
NEET - 2013
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A round disc of the moment of inertia l2 about its axis perpendicular to its plane and passing through its center is placed over another disc of the moment of inertial l1 rotating with an angular velocity ω about the same axis. The final angular velocity of the combination of discs is

1.  l2ωl1 + l2

2.  ω

3.  l1ωl1 + l2

4.  l1 + l2ωl1

Subtopic:  Angular Momentum |
 75%
From NCERT
PMT - 2004
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A light cord is wrapped around the rim of the wheel disc of radius r and a steady downward pull F is exerted on the cord, then the angular acceleration of the wheel is

1. FMr           

2. 2FM               

3. 2FMr               

4. M2F

Subtopic:  Torque |
 77%
From NCERT
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Which of the following will not be affected if the radius of the sphere is increased while keeping mass constant?

1. Moment of inertia 2. Angular momentum
3. Angular velocity 4. Rotational kinetic energy
Subtopic:  Angular Momentum |
 64%
From NCERT
NEET - 2018
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A particle of mass 5 g is moving with a uniform speed of 32cm/s in the x-y plane along the line y = 25cm. The magnitude of its angular momentum about the origin in g-cm2/s is

1.  0

2.  30

3.  302

4.  3010

Subtopic:  Angular Momentum |
 71%
From NCERT
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A mass M is supported by a massless string wound round a uniform cylinder of mass M and radius R. On releasing the mass from rest, it will fall with an acceleration assuming no slipping-

                       

1.  g3

2.  g2

3.  2g3

4.  g

Subtopic:  Torque |
 65%
From NCERT
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A closed tube partly filled with water lies in a horizontal plane. If the tube is rotated about perpendicular bisector, the moment of inertia of the system

1. increases

2. decreases

3. remains constant

4. depends on sense of rotation

Subtopic:  Moment of Inertia |
 62%
From NCERT
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A disc is rotating With an angular speed of m. If a child sits on it, which of the following is conserved? 

1.  kinetic energy 

2.  potential energy 

3.  linear momentum 

4.  angular momentum

Subtopic:  Angular Momentum |
 89%
From NCERT
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A particle moves in a force field given by F = r^ F r, where r is the unit vector along with the position vector r, then which is true? 

1.  The torque acting on the particle is not zero 

2.  The torque acting on the particle produces an angular acceleration in it 

3.  The angular momentum of the particle is conserved 

4.  The angular momentum of the particle increases.

Subtopic:  Angular Momentum |
 70%
From NCERT
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Four masses are fixed on a massless rod as shown in the figure. The moment of inertia about the axis P is about

               

1.  2 kg-meter2

2.  1 kg-meter2

3.  0.5 kg-meter2

4.  0.3 kg-meter2

Subtopic:  Moment of Inertia |
 72%
From NCERT
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