A body moving around a fixed axis constitutes :
rotational motion
circular motion
plane motion
simultaneous translation and rotation
The rotational analogue of force in linear motion is
couple
torque
moment of momentum
moment of inertia
A zero torque acting on a system will result in conversation of
linear velocity
angular velocity
angular momentum
moment of momentum
A rotating body needs a torque of 2 * 10-4 Nm to acquire an angular acceleration of 4 rad/s2. The moment of inertia of the body is
0.25 * 10-4 kg m2
0.5 * 10-4 kg m2
0.75 * 10-4 kg m2
1.0 * 10-4 kg m2
The flywheel of a system of a steam engine has a radius of gyration of 1 m and a mass of 2500 kg. The starting torque of the engine is 1500 Nm and remains constant. The angular acceleration of the flywheel is
0.6 rad/s2
0.83 rad/s2
1.2 rad/s2
1.67 rad/s2
A person standing on a uniformly rotating turn table has his arms held close to his chest. If he outstretches his arms
the moment of inertia will decrease
the angular momentum will increase
the speed of rotation will decrease
the angular velocity will remain constant
A ring (mass 0.3 kg and radius 0.1 m) and a solid cylinder (mass 0.4 kg and radius 0.1 m) are given the same kinetic energy and released simultaneously on a flat horizontal surface such that they begin to roll towards a wall which is at the same distance from the ring and cylinder. If the rolling friction is negligible, then :
cylinder will reach the wall first
ring will reach the wall first
both will reach the wall at the same time
date is insufficient to make any prediction
A solid sphere of mass m and radius r rolls, without slipping, with uniform velocity V along straight line on a horizontal table. The total energy will be
2/5 mV2
5/6 mV2
7/10 mV2
3/8 mV2
A body of mass m attached to a string of length l constitutes a simple pendulum. At the instant when the bob acquires maximum speed v while executing simple harmonic motion, the tension in the string equals
mg + mv2
mg + mv2/2l
mg + mv2/l
mg + 2 mv2/l