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JAMB Physics 2010 Question 10

Question 10

Simple Machines

A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through 1 m. Find the efficiency of the machine.

  1. A.50.0%.
  2. B.22.2%.
  3. C.33.3%.
  4. D.55.6%.
Show the answer and explanation

Answer: C (33.3%.)

Explanation

MA = 800 ÷ 400 = 2. Efficiency = MA/VR × 100% = 2/6 × 100% ≈ 33.3%.