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Power and efficiency

Power and efficiency

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Question 16

An electric winch is used to lift a cargo container of mass 120 kg vertically upwards at a constant speed of 1.5 m s-1. Given that the winch is 70% efficient, find the minimum electrical power input to the winch motor.

Assume the acceleration due to gravity is g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2.

A

1.23 kW1.23\text{ kW}1.23 kW

B

1.76 kW1.76\text{ kW}1.76 kW

C

2.52 kW2.52\text{ kW}2.52 kW

D

1.12 kW1.12\text{ kW}1.12 kW

Markscheme

Power and efficiency Questions

  1. GCSE
  2. /Physics
  3. /Power and efficiency

37 exam-style questions on OCR GCSE Physics Power and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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