Physics-
General
Easy
Question
A girl sits near the edge of a rotating circular platform. If the girl moves from circumference toward the centre of the platform then the angular velocity of the platform will-
- decrease
- increase
- remain same
- becomes zero
The correct answer is: increase
Related Questions to study
Physics-
A uniform heavy disc is rotating at constant angular velocity () about a vertical axis through its centre O. Some wax W is dropped gently on the disc. The angular velocity of the disc-
A uniform heavy disc is rotating at constant angular velocity () about a vertical axis through its centre O. Some wax W is dropped gently on the disc. The angular velocity of the disc-
Physics-General
Physics-
Flywheel is an important part of steam engine because -
Flywheel is an important part of steam engine because -
Physics-General
Physics-
A disc of mass 4 kg and of radius 1m rolls on a horizontal surface without slipping such that the velocity of its centre of mass is 10 cm/sec. Its rotational kinetic energy is-
A disc of mass 4 kg and of radius 1m rolls on a horizontal surface without slipping such that the velocity of its centre of mass is 10 cm/sec. Its rotational kinetic energy is-
Physics-General
Physics-
A uniform thin rod of length l is suspended from one of its ends and is rotated at f rotations per second. The rotational kinetic energy of the rod will be -
A uniform thin rod of length l is suspended from one of its ends and is rotated at f rotations per second. The rotational kinetic energy of the rod will be -
Physics-General
Physics-
Out of two spheres each of mass 100 gm, one slips while the other rolls. Their speed is 10 cm/sec. The ratio of their kinetic energy is-
Out of two spheres each of mass 100 gm, one slips while the other rolls. Their speed is 10 cm/sec. The ratio of their kinetic energy is-
Physics-General
Physics-
The velocity of centre of mass of a disc rolling on an inclined plane changes from V to 2V at any instant of time. If M is the mass of disc then increase in its kinetic energy will be-
The velocity of centre of mass of a disc rolling on an inclined plane changes from V to 2V at any instant of time. If M is the mass of disc then increase in its kinetic energy will be-
Physics-General
Physics-
The kinetic energy of rotation of a particle is 18 Joule. If the angular momentum vector coincides with the axis of rotation and the moment of inertia of the particle about this axis is 0.01 kg-m, then its angular momentum will be-
The kinetic energy of rotation of a particle is 18 Joule. If the angular momentum vector coincides with the axis of rotation and the moment of inertia of the particle about this axis is 0.01 kg-m, then its angular momentum will be-
Physics-General
Physics-
Let 
be a force acting on a particle having position vector 
. Let 
be the torque of this force about the origin, then-
Let be a force acting on a particle having position vector . Let be the torque of this force about the origin, then-
Physics-General
Physics-
A body is rotating non uniformly about a vertical axis fixed in an inertial frame. The resultant force on a particle of the body not on the axis is-
A body is rotating non uniformly about a vertical axis fixed in an inertial frame. The resultant force on a particle of the body not on the axis is-
Physics-General
Physics-
A particle is at a distance r from the axis of rotation. A given torque produces some angular acceleration in it. If the mass of the particle is doubled and its distance from the axis is halved, the value of torque to produce the same angular acceleration is -
A particle is at a distance r from the axis of rotation. A given torque produces some angular acceleration in it. If the mass of the particle is doubled and its distance from the axis is halved, the value of torque to produce the same angular acceleration is -
Physics-General
Physics-
A ring of diameter 1m is rotating with an angular momentum of 10 Joules-sec. The necessary tangential force required to increase its angular momentum by 50% in 1 sec will be (in newton)-
A ring of diameter 1m is rotating with an angular momentum of 10 Joules-sec. The necessary tangential force required to increase its angular momentum by 50% in 1 sec will be (in newton)-
Physics-General
Physics-
The three similar torque () are acting at an angle of 120º with each other. The resultant torque will be-
The three similar torque () are acting at an angle of 120º with each other. The resultant torque will be-
Physics-General
Physics-
A torque of 2 newton-m produces an angular acceleration of 2 rad/sec2 a body. If its radius of gyration is 2m, its mass will be -
A torque of 2 newton-m produces an angular acceleration of 2 rad/sec2 a body. If its radius of gyration is 2m, its mass will be -
Physics-General
Physics-
The angular velocity of a body is 
and a torque 
acts on it. The rotational power will be-
The angular velocity of a body is and a torque acts on it. The rotational power will be-
Physics-General
Physics-
A force of 
acts at a point 
metre from the origin. The magnitude of torque is -
A force of acts at a point metre from the origin. The magnitude of torque is -
Physics-General
