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
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. | \(6 \hat{i}-2 \hat{j}+8 \hat{k}\) |
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. \(2\pi v / T\)
2. \(2\pi r / T\)
3. \(2\pi r^2 / T\)
4. \(2\pi v^2 / T\)
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 at \(\neq\) 0
3. ar \(\neq\) 0 but at = 0
4. ar \(\neq\) 0 and at \(\neq\) 0