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Powering Earth

Powering Earth

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Question 2

An environmental engineering firm is designing an offshore wind farm to assist in powering a coastal region. The proposal consists of 40 identical wind turbines, each having blades of length 45 m. The local average wind speed at the hub height is 12 m s-1, and the density of air is 1.2 kg m-3. If the wind farm operates with an overall efficiency of 35% in converting the kinetic energy of the incoming wind into electrical power, what is the estimated total electrical power output of the wind farm?

A

2.3×106 W2.3 \times 10^6\text{ W}2.3×106 W

B

9.2×107 W9.2 \times 10^7\text{ W}9.2×107 W

C

1.8×108 W1.8 \times 10^8\text{ W}1.8×108 W

D

7.7×106 W7.7 \times 10^6\text{ W}7.7×106 W

Markscheme

Powering Earth Questions

  1. GCSE
  2. /Physics
  3. /Powering Earth

39 exam-style questions on OCR GCSE Physics Powering Earth. Each one has a worked solution and a mark scheme showing where the marks go.

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