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JAMB Physics 2002 Question 6

Question 6

Simple Machines

A wheel and axle is used to raise a load of 500 N by the application of an effort of 250N. If the radii of the wheel and the axle are 0.4cm and 0.1 cm respectively, the efficiency of the machine is

  1. A.60%
  2. B.50%
  3. C.40%
  4. D.20%
Show the answer and explanation

Answer: B (50%)

Explanation

VR = 0.4/0.1 = 4 and MA = 500/250 = 2, so efficiency = 2/4 × 100% = 50%.