64
A body weighing 100N moves with a speed of 5ms-1 in a horizontal circular path of radius 5m. Calculate the . magnitude of the centripetal force acting on the body. (g = 10ms-2)
- A. 10N
- B. 50N
- C. 75N
- D. 100N
65
Palm oil from a bottle flows out more easily after it as been heated because the
- A. molecules are given potential energy during the heating
- B. friction between oil layers is reduced
- C. oil molecules force each other out
- D. adhesion between the oil molecules and those of the bottle is increased
66
A net force of magnitude 0.6N acts on a body of mass 40g, initially at rest. Calculate the magnitude of tire resulting acceleration.
- A. 90ms-2
- B. 60ms-2
- C. 30ms-2
- D. 15ms-2.
67
The force between molecules of the same substance is termed
- A. elastic force
- B. repulsive force
- C. cohesive force
- D. adhesive force