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JAMB Physics 2000 Question 10

Question 10

Simple Machines

The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150 N with the machine?

  1. A.50 N
  2. B.40 N
  3. C.30 N
  4. D.20 N
Show the answer and explanation

Answer: B (40 N)

Explanation

MA = efficiency × VR = 0.75 × 5 = 3.75. Effort = load ÷ MA = 150/3.75 = 40 N.