CBSE
The moment of inertia of a thin rod of mass M and length L, about an axis perpendicularto the rod at a distance from one end is
If the earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take
96 h
48 h
6 h
1.5 h
Moment of a couple is called
impulse
couple
torque
angular momentum
Three identical spheres, each ofmass 1 kg are kept as shown in figure below, touching each other, with their centres on a straight line. If their centres are marked P, Q, R respectively, the distance of centre of mass of the system from P is
A shell of mass 10 kg is moving with a velocity of 10 ms-1 when it blasts and forms two parts of mass 9 kg and 1 kg respectively. If the 1st mass is stationary, the velocity of the 2nd is
1 m/s
10 m/s
100 m/s
1000 m/s
The moment of inertia of a uniform circular disc of radius R and mass M about an axis passing from the edge ofthe disc and normal to the disc is
MR2
Two blocks of equal masses m are released from the top of a smooth fixed wedge as shown in the figure. The acceleration of the centre of mass of the two blocks is
g
A motor is rotating at a constant angular velocity of 500 rpm. The angular displacement per second is
A circular disc rolls down on an inclined plane without slipping. What fraction of its total energy is translational ?
If the length of the second's hand in a stop-clock is 3 cm, the angular velocity and linear velocity of the tip is
0.2047 rad/s , 0.0314 ms-1
0.2547 rad/s , 0.314 ms-1
0.1472 rad/s , 0.06314 ms-1
0.1047 rad/s , 0.00314 ms-1