Work, Energy & Power — Hard (50 Questions | 45 minutes)

Practice 80 questions on Work, Energy & Power — Hard (50 Questions | 45 minutes). Includes: The K.E. of a body increases from 4 J to 36 J. The…; A ball on a string undergoes vertical circular motion.…; A pump lifts water at the rate of 5 kg/s to a height…. Free quiz on NoteTube.

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1.
A vehicle of mass m travels at constant speed v on a level road. The driving force equals friction force f. The power delivered by the engine is:
2.
Work done by friction on a block of mass m sliding down an inclined plane (length L, angle α, μₖ):
3.
A body undergoes elastic collision. Which quantity is NOT necessarily conserved?
4.
The kinetic energy of a body at the lowest point of a vertical circle is E. At the highest point (radius R), it is:
5.
A ball on a string undergoes vertical circular motion. At the topmost point, the string breaks. The ball's subsequent trajectory is:

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