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JAMB Physics 1991 Question 8

Question 8

Simple Machines

A wheel and axle have radii 80 cm and 10 cm respectively. If the efficiency of the machine is 0.85, an applied force of 1200 N to the wheel will raise a load of

  1. A.8.0 N
  2. B.6.8 N
  3. C.8160.0 N
  4. D.9600.0 N
Show the answer and explanation

Answer: C (8160.0 N)

Explanation

VR = 80/10 = 8. MA = 0.85 × 8 = 6.8. Load = 6.8 × 1200 = 8160 N.