If the body is moving in a circle of radius r with a constant speed v, its angular velocity is:
1. v2/r
2. vr
3. v/r
4. r/v
Two racing cars of masses m1 and m2 are moving in circles of radii r1 and r2 respectively. Their speeds are such that each makes a complete circle in the same duration of time t. The ratio of the angular speed of the first to the second car is:
1. | m1:m2 | 2. | r1:r2 |
3. | 1:1 | 4. | m1r1:m2r2 |
If a particle moves in a circle describing equal angles in equal times, its velocity vector:
1. remains constant.
2. changes in magnitude.
3. changes in direction.
4. changes both in magnitude and direction.
A motorcyclist going round in a circular track at a constant speed has:
1. constant linear velocity.
2. constant acceleration.
3. constant angular velocity.
4. constant force.
A particle P is moving in a circle of radius ‘a’ with a uniform speed v. C is the centre of the circle and AB is a diameter. When passing through B the angular velocity of P about A and C are in the ratio
1. 1 : 1
2. 1 : 2
3. 2 : 1
4. 4 : 1
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 |
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
A particle is moving in a horizontal circle with constant speed. It has constant
1. Velocity
2. Acceleration
3. Kinetic energy
4. Displacement
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
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