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Physics (AS & A Level) · May / June 2023 · Paper 11 · Question 13

9702Equilibrium of forces

The diagram shows a ball of weight W hanging in equilibrium from a string. The string is at an angle θ to the vertical. The tension in the string is T. The ball is held away from the wall by a horizontal force P from a metal rod. Which relationship between the magnitudes of T, P and W is correct?

  1. AP = T cosθ and W = T sinθ
  2. BT = P + W
  3. CT² = P² + W²
  4. DW = P tanθ and W = T cosθ

As printed in the paper

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Correct answer: C. T² = P² + W²

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