A particle is moving in a circular orbit with constant speed. Select wrong alternate

1. Its linear momentum is conserved
2. Its angular momentum is conserved
3. It is moving with variable velocity
4. It is moving with variable acceleration
Subtopic:  Linear Momentum |
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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 \(\text{I}_{A}\) and \(\text{I}_{B}\) such that
1. \(\text{I}_{\text{A}}=\text{I}_{\text{B}}\)
2. \(\text{I}_{\text{A}}>\text{I}_{\text{B}}\)
3. \(\text{I}_{\text{A}}<\text{I}_{\text{B}}\)
4. \(\frac{\text{I}_{\text{A}}}{\text{I}_{\text{B}}}=\frac{d_A}{d_B}\)

Subtopic:  Moment of Inertia |
 74%
From NCERT
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A particle of mass \(1 ~\text{kg}\) is kept at (1m, 1m, 1m). \((1~\text{m},~1~\text{m},~1~\text{m}),\) The moment of inertia of this particle about \(z-\)axis would be
1. \(1~\text{kg}-\text{m}^2\)
2. \(2~\text{kg}-\text{m}^2\)
3. \(3~\text{kg}-\text{m}^2\)
4. None of these

Subtopic:  Moment of Inertia |
 51%
From NCERT
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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:

       
1. \(\frac{1}{2} M R^2\)
2. \(\frac{1}{4} M R^2\)
3. \(\frac{1}{8} M R^2\)
4. \(\sqrt{2} M R^2\)

Subtopic:  Moment of Inertia |
 59%
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 |
 73%
From NCERT
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A solid sphere, a hollow sphere, and a disc, all having the same mass and radius, are placed at the top of a smooth incline and released. Least time will be taken in reaching the bottom by  

1. the solid sphere
2. the hollow sphere
3. the disc
4. all will take the same time  
Subtopic:  Rolling Motion (OLD NCERT) |
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Two bodies with moment of inertia I2 and I2(such that I1>I2) have equal angular velocity.  If their kinetic energy of rotation are E1 and E2 then [Pb. PET 2000]

1. E1E2                             

2. E1>E2

3. E1<E2                             

4. E1=E2 

 

 74%
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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 |
 66%
From NCERT
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A wheel of radius R rolls on the ground with a uniform velocity v. The velocity of topmost point relative to the bottommost point is

1. v

2. 2v

3. v/2

4. zero

 

Subtopic:  Rolling Motion (OLD NCERT) |
 71%
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If the net external forces acting on the system of particles is zero, then which of the following may vary ?

1. Momentum of the system

2. Velocity of centre of mass

3. Position of centre of mass

4. None of the above

Subtopic:  Center of Mass |
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