Give reason. a) A coolie carries a heavy load on his head along one kilometer long level road. What is the work done by him against the load? b) No work is done when a person pushes against a strong wall. c) A horse has more kinetic energy than a dong running with the same speed. d) Power is more if work is performed in lesser time. e) Water falling from a height can rotate the turbine of hydel power plant.
Answers
Answer:
1. The work done by a coolie walking on levelled road with load on his head is zero
2. Even though the man exerts force on the wall , the wall does not move. Work done = force applied * displacement and since the displacement of the wall is zero. , work done is also zero. Answer: Even though the man exerts force on the wall , the wall does not move.
3. If a dog and horse are running with the same speed, kinetic energy of horse is more than the kinetic energy of the dog because the mass of a horse is more than the dog. So, more the mas more the kinetic energy is.
4. Power is inversely proportional to time.So, if the work is done in less time, then power will be more and vice-versa. so power is more if work is performed in lesser time...
5. Water stored at a height has potential energy. When it is allowed to fall down then it gain kinetic energy. This kinetic energy gets transferred into the turbine. That's how to turbine rotates.
Explanation:
Hope it helps
Please mark as brainliest
Please follow me friend