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20 October, 19:17

An automobile use a 75,000 J of chemical energy from Gosselin produce 10,000 J of useful output energy

A. calculator it's efficiency

B. where does the lost energy go, that part of the input work that doesn't become useful work?

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Answers (2)
  1. 20 October, 22:14
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    A. (10000/75000) 100%

    =13.3%, cor to 3sf

    B. prob used to warm up the engine / lost to atmosphere
  2. 20 October, 23:12
    0
    A. 13.3% (1d. p)

    B.

    Explanation:

    A. Efficiency can be calculated by dividing useful output by total input and multiply it by 100.

    Therefore (10000/75000) x100 = 13.333333 ... %

    B. Most of the energy is lost as heat energy.
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