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JAMB Physics 2006 Question 12

Question 12

Equilibrium of Forces

A mirror of weight 75 N is hung by a cord from a hook on the wall. If the cord makes an angle of 30° with the horizontal, the tension in the cord is

  1. A.150 N.
  2. B.100 N .
  3. C.1500 N.
  4. D.250 N.
Show the answer and explanation

Answer: A (150 N.)

Explanation

The vertical part of the tension holds up the weight: T sin 30° = 75 N, so T = 75 ÷ 0.5 = 150 N.