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1.7.4 Power

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Question 55

A crane is used to lift a heavy cargo container through a vertical distance of 5.0 m at a constant speed.

The operator increases the input power to the electric motor of the crane and lifts the same container through the same distance. The efficiency of the motor remains the same.

Which row in the table correctly describes the effect of this change on the useful work done lifting the container and on the time taken to lift it?

Useful work doneTime taken
Adecreasesdecreases
Bstays the samedecreases
Cdecreasesstays the same
Dstays the samestays the same
A

Useful work done: decreases; Time taken: decreases

B

Useful work done: stays the same; Time taken: decreases

C

Useful work done: decreases; Time taken: stays the same

D

Useful work done: stays the same; Time taken: stays the same

Markscheme

1.7.4 Power Questions

  1. IGCSE
  2. /Physics
  3. /1.7.4 Power

95 exam-style questions on CIE IGCSE Physics 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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