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JAMB Physics 1991 Question 6

Question 6

Equilibrium of Forces

Find the tension T1 in the diagram above if the system is in equilibrium. [g = 10 m s−2]

Diagram for this question
  1. A.200/√3 N
  2. B.100/√3 N
  3. C.300/√3 N
  4. D.100 N
Show the answer and explanation

Answer: B (100/√3 N)

Explanation

The 100 N weight is held by the vertical part of T2: T2 cos 30° = 100, so T2 = 200/√3 N. The horizontal parts balance: T1 = T2 sin 30° = 100/√3 N.