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 \(m_1\) and \(m_2\) are moving in circles of radii \(r_1\) and \(r_2\) 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. | \(m_1:m_2\) | 2. | \(r_1:r_2\) |
3. | \(1:1\) | 4. | \(m_1r_1:m_2r_2\) |
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 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.
2.
3.
4.
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
The angular speed of seconds needle in a mechanical watch is:
1. rad/s
2. 2π rad/s
3. π rad/s
4. rad/s