Physics 9702 · AS & A Level · Equilibrium of forces

Equilibrium of forces — practice question

The diagram illustrates an experiment used to find the force acting on a ball due to a horizontal air flow. The ball hangs from a light string and has a weight of $0.15\,\text{N}$. The string is displaced $30^\circ$ from the vertical. The ball is in equilibrium. What is the force on the ball from the air flow?

  • A$0.075\,\text{N}$
  • B$0.087\,\text{N}$
  • C$0.26\,\text{N}$
  • D$0.30\,\text{N}$

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