A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm
A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm from the unstretched position. The work required to stretch it further by another 5 cm is
Options
(a) […]
Work Energy and Power
Two bodies of mass 0.25 kg each moving towards each other with velocity
Two bodies of mass 0.25 kg each moving towards each other with velocity 3 m/s and 1 m/s respectively. After collision they stick together. The velocity of the combination will be
Options
(a) […]
A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden
A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden block and is stopped after a distance of 0.40m. The average resistive force exerted by the block on the […]
A body A experiences perfectly elastic collision with a stationary body B
A body A experiences perfectly elastic collision with a stationary body B. If after collision the bodies fly apart in the opposite directions with equal velocities, the mass ratio fo A and B is
In stretching a spring by 2 cm, energy stored is given by U. Had is been stretched
In stretching a spring by 2 cm, energy stored is given by U. Had is been stretched by 10 cm, energy stored will be
Options
(a) U (b) 25U (c) U/25 (d) 5U
The potential energy of a system increases if work is done
The potential energy of a system increases if work is done
Options
(a) upon the system by a non conservative force (b) by the system against a conservative force (c) by the system […]
300j work is done in sliding a 2kg block up an inclined plane of height 10m
300j work is done in sliding a 2kg block up an inclined plane of height 10m.Taking g=10 ms⁻², work done against friction is
Options
(a) 200 j (b) 100 j (c) Zero (d) […]
A circular disc rolls down an inclined plane.The ratio of rotational kinetic energy
A circular disc rolls down an inclined plane. The ratio of rotational kinetic energy to total kinetic energy is
Options
(a) 1/2 (b) 1/3 (c) 2/3 (d) 3/4
Correct Answer:
1/3
Explanation:
No explanation […]
The momentum of a body is increased by 20%.The percentage increases in kinetic energy
The momentum of a body is increased by 20%.The percentage increases in kinetic energy is
Options
(a) 54 % (b) 44 % (c) 100 % (d) 50 %
Correct Answer:
44 %
Explanation:
Increase […]
A bullet is shot from a riffle. As a result the rifle recoils.The kinetic energy of riffle
A bullet is shot from a riffle. As a result the rifle recoils.The kinetic energy of riffle as compared to that of bullet is
Options
(a) less (b) greater (c) equal (d) cannot be concluded
Correct […]