An electric motor car has a rating of 500 watt. How much energy per minute is delivered by it?
Correct answer: D. 30 kJ
- A. 500 J
- B. 3 kJ
- C. 5 kJ
- D. 30 kJ
Explanation
Energy per minute = Power × time = 500 W × 60 s = 30000 J = 30 kJ. Thus option D is correct.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Work and Energy questions
The force constant of a wire is k and that of the another wire is 3k when both the wires are stretched through same distance, if work done are W1 and W2, then
A body of mass 100 g is raised vertically from surface of Earth in a gravitational field. The P.E of the body at height 100 m is:
Which one of the following quantities CANNOT be used as a unit of potential energy?
If a mass of 5 Kg is lifted upto 5m height, what will be the work done against the gravitational field?
A person walks 2 m with an acceleration of 5 m s⁻², holding an object of mass 2 kg. The net work done on the object is
A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 m s⁻¹. The K.E of other mass is