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JAMB Physics 2014 Question 14

Question 14

Simple Machines

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a velocity ratio of 4.

  1. A.233.33 N.
  2. B.333.33 N.
  3. C.334.33 N.
  4. D.343.32 N.
Show the answer and explanation

Answer: B (333.33 N.)

Explanation

MA = efficiency × VR = 0.75 × 4 = 3. Effort = load ÷ MA = 1000 ÷ 3 ≈ 333.33 N.