A particle moves with constant angular velocity in a circle. During the motion its:

1. Energy is conserved
2. Momentum is conserved
3. Energy and momentum both are conserved
4. None of the above is conserved

Subtopic:  Circular Motion |
From NCERT
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Two bodies of mass 10 kg and 5 kg moving in concentric orbits of radii R and r such that their periods are the same. Then the ratio between their centripetal acceleration is 

(1) R/r

(2) r/R

(3) R2/r2

(4) r2/R2

Subtopic:  Circular Motion |
 62%
From NCERT
PMT - 2001
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A particle is moving in a horizontal circle with constant speed. It has constant 

(1) Velocity

(2) Acceleration

(3) Kinetic energy

(4) Displacement

Subtopic:  Circular Motion |
 69%
From NCERT
PMT - 1987
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The angular speed of a flywheel making 120 revolutions/minute is: 

(1) 2π  rad/s

(2) 4π2  rad/s

(3) π  rad/s

(4) 4π  rad/s

Subtopic:  Circular Motion |
 78%
From NCERT
PMT - 1995
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Certain neutron stars are believed to be rotating at about 1 rev/sec. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be 

(1) 20×108m/sec2

(2) 8×105m/sec2

(3) 120×105m/sec2

(4) 4×108m/sec2

Subtopic:  Circular Motion |
 69%
From NCERT
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An electric fan has blades of length 30 cm as measured from the axis of rotation. If the fan is rotating at 1200 r.p.m, the acceleration of a point on the tip of the blade is about

(1) 1600 m/sec2

(2) 4740 m/sec2

(3) 2370 m/sec2

(4) 5055 m/sec2

Subtopic:  Circular Motion |
 75%
From NCERT
PMT - 1990
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The angular speed of seconds needle in a mechanical watch is:

(1) π30 rad/s

(2) 2π rad/s

(3) π rad/s

(4) 60π rad/s

Subtopic:  Circular Motion |
 76%
From NCERT
PMT - 1999
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What is the value of linear velocity if \(\overset{\rightarrow}{\omega} = 3\hat{i} - 4\hat{j} + \hat{k}\) and \(\overset{\rightarrow}{r} = 5\hat{i} - 6\hat{j} + 6\hat{k}\)  :

1. \(6 \hat{i}+2 \hat{j}-3 \hat{k} \)           
2. \(-18 \hat{i}-13 \hat{j}+2 \hat{k} \)
3. \(4 \hat{i}-13 \hat{j}+6 \hat{k}\)
4. \(6 \hat{i}-2 \hat{j}+8 \hat{k}\)

Subtopic:  Circular Motion |
 85%
From NCERT
PMT - 2000
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A particle moves with constant speed v along a circular path of radius r and completes the circle in time T. The acceleration of the particle is:

1. 2 π v/T

2. 2 π r/T

3. 2 π r2/T

4. 2 π v2/T

Subtopic:  Circular Motion |
 62%
From NCERT
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In \(1.0\) s, a particle goes from point A to point B, moving in a semicircle of radius \(1.0\) m (see figure). The magnitude of the average velocity is:

   
1. \(3.14\) m/s
2. \(2.0\) m/s
3. \(1.0\) m/s
4. zero

Subtopic:  Speed & Velocity |
 69%
From NCERT
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