CBSE
A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms'.The kinetic energy of the other mass is
256 J
486 J
524 J
324 J
A cone filled with water is revolved in a vertical circle of radius 4 m and the water does not fall down. What must be the maximum period of revolution?
2 s
4 s
1 s
6 s
A car of mass 1000 kg moves on a circular track of radius 20 m. If the coefficient of friction of 0.64. The maximum velocity with which the car can be moved is
11.2m/s
112m/s
A particle of mass m moving with velocity v collides with a stationary particle of mass 2m. The speed of the system, will be
3v
2v
A body of mass 0.1 kg attains a velocity of 10 ms' in 0.1 sec. The force acting on the body is
10N
0.01N
0.1N
100N
A drum of radius R and mass M, rolls down without slipping along an inclined plane of angle θ. The frictional force
converts translational energy to rotational energy
dissipates energy as heat
decreases the rotational motion
decreases the rotational and translational motion
Two weights w1 and w2 are suspended to the two strings on a frictionless pulley. When the pulley is pulled up with an acceleration g, then the tension in the string is :
The angle through which a cyclist bends when he covers a circular path of 34.3 m circumference in sec is (g=9.8 m/s)
150
300
600
450
A body is moving in a circular path with acceleration 'a'. If its velocity gets doubled, find the ratio of acceleration after and before the change
1:4
2:1
4:1