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

Concept Questions :-

Circular motion
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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

Concept Questions :-

Circular motion
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The angular speed of a fly wheel making 120 revolutions/minute is  

(1) 2π  rad/s

(2) 4π2  rad/s

(3) π  rad/s

(4) 4π  rad/s

Concept Questions :-

Circular motion
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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

Concept Questions :-

Circular motion
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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

Concept Questions :-

Circular motion
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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

Concept Questions :-

Circular motion
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What is the value of linear velocity, if ω=3i^4j^+k^ and r=5i^6j^+6k^ 

(1) 6i^+2j^3k^

(2) 18i^13j^+2k^

(3) 4i^13j^+6k^

(4) 6i^2j^+8k^

Concept Questions :-

Circular motion
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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) 2πv/T

(2) 2πr/T

(3) 2πr2/T

(4) 2πv2/T

Concept Questions :-

Circular motion
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In uniform circular motion

(1) Both the angular velocity and the angular momentum vary

(2) The angular velocity varies but the angular momentum remains constant

(3) Both the angular velocity and the angular momentum stay constant

(4) The angular momentum varies but the angular velocity remains constant

Concept Questions :-

Circular motion
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If ar and at represent radial and tangential accelerations, the motion of a particle will be uniformly circular if 

(1) ar = 0 and at = 0

(2) ar = 0 but at0

(3) ar0 but at = 0

(4) ar0 and at0

Concept Questions :-

Circular motion
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