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
Consider the two statements given below:
Statement-1 : Infrared waves are also called heat waves.
Statement-2 : Water molecules readily absorb infrared waves.
Select the correct answer using the code given below :
Both the statements are individually true and Statement-2 is the correct explanation of Statement-1.
Both the statements are individually true, but Statement-2 is not the correct explanation of Statement-1.
Statement-1 is true, but Statement-2 is false.
Statement-2 is true, but Statement-1 is false.