What is the power of a body if 1N force is acted upon a body have a constant velocity of 10ms^-1?
Correct answer: D. 10
- A. 0
- B. 30
- C. 0.5
- D. 10
Explanation
Power is the rate at which work is done. It is defined as the work done per unit time.Power (P) = Work Done (W) / Time (t)Work done (W) = Force (F) * Displacement (S)Since the body is moving with a constant velocity, the displacement is equal to the velocity multiplied by the time:S = v * tSubstituting this into the equation for work done:W = F * v * tSubstituting this into the equation for power:P = (F * v * t) / t = F * vGiven that the force (F) is 1N and the velocity (v) is 10ms^-1, the power is:P = 1N * 10ms^-1 = 10 Watts
Last updated
About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
Practise Work and Energy
748 free Work and Energy MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.