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Power and efficiency

Power and efficiency

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Question 12

A motorized winch with an efficiency of 75% is used to raise a load of mass 120 kg vertically at a constant speed of 2.5 m s-1.

Taking the acceleration due to gravity to be g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2, calculate the electrical power input to the winch motor.

A

2.21 kW2.21\text{ kW}2.21 kW

B

2.94 kW2.94\text{ kW}2.94 kW

C

3.92 kW3.92\text{ kW}3.92 kW

D

0.40 kW0.40\text{ kW}0.40 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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