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JAMB Physics 1983 Question 36

Question 36

Simple Machines

A machine has a velocity ratio of 5. It requires a 50 kg weight to overcome a 200 kg weight. The efficiency is

  1. A.4%
  2. B.5%
  3. C.40%
  4. D.50%
  5. E.80%
Show the answer and explanation

Answer: E (80%)

Explanation

Mechanical advantage = 200/50 = 4. Efficiency = MA/VR × 100% = 4/5 × 100% = 80%.