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Energy in Physics Quiz App Download & e-Book | 244

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MCQ: 244

The ratio for the efficiency of a machine is

  1. (useful energy output + energy input) × 100&percent;
  2. (useful energy output - energy input) × 100&percent;
  3. (useful energy input / energy output × 100&percent;
  4. (useful energy output / energy input) × 100&percent;
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