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JAMB Physics 1992 Question 9

Question 9

Simple Machines

A machine requires 1000 J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the machine.

  1. A.80%
  2. B.75%
  3. C.50%
  4. D.33%
Show the answer and explanation

Answer: B (75%)

Explanation

Useful work output = 500 × 1.5 = 750 J. Efficiency = 750/1000 × 100% = 75%.