CBSE
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
A motor is rotating at a constant angular velocity of 500 rpm. The angular displacement per second is
Moment of a couple is called
impulse
couple
torque
angular momentum
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
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
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
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
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
A circular disc rolls down on an inclined plane without slipping. What fraction of its total energy is translational ?
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