A ball of 0.1 kg mass is dropped on a hard floor from a height of 0.45 m and rises to a height of 0.2 m. If it was in touch with the floor for 0.1 s, the net force it applied on the floor while bouncing is : (take the gravitational acceleration g = 10 m s⁻²)
1.0 N
6.0 N
3.0 N
5.0 N
Which one of the following statements regarding simple pendulum is correct?
Simple pendulum has a time period independent of amplitude:
only for small amplitudes because then the net force on its bob is independent of its displacement.
for any amplitude because the net force on the bob is always proportional to its displacement.
for any amplitude because the net force on the bob is independent of its displacement.
only for small amplitudes because then the net force on its bob is proportional to its displacement.
Which one of the following about different frictional forces is correct?
Kinetic friction > Static friction > Rolling friction
Static friction > Rolling friction > Kinetic friction
Static friction > Kinetic friction > Rolling friction
Static friction > Kinetic friction = Rolling friction
A metallic bob X of mass m is released from position A. It collides elastically with another identical bob Y placed at rest at position B on a horizontal frictionless table. The angle AOB is 30°.
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How high does the bob X rise immediately after the collision?
To the same height as that of position A on the other side in the same trajectory
To half the height as that of position A on the other side along the same trajectory
The same height at position A
It stops at position B