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1.7.4 Power

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Question 78

A conveyor belt and a crane are both used to lift a cargo crate from ground level to a platform.

The conveyor belt takes 45 s to lift the crate. The useful work done on the crate is $W$ , and the average useful power developed by the conveyor belt is $P$ .

The crane takes 15 s to lift the same cargo crate from ground level to the same platform.

Which of the following describes the useful work done by the crane and the average useful power developed by the crane?

Useful work is less than $W$ , useful power is more than $P$

Useful work is $W$ , useful power is more than $P$

Useful work is $W$ , useful power is less than $P$

Useful work is more than $W$ , useful power is $P$

Markscheme

1.7.4 Power Questions

IGCSE
Physics
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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