Which one of the following does not apply to sound waves in fluids?
They transport energy
They need a medium to travel
They are transverse
They travel faster in liquids than in gases
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