Physics 9702 · AS & A Level · Turning effects of forces

Turning effects of forces — practice question

A crane is fitted with a counterweight so that it does not topple while raising a load, as illustrated. The counterweight has a mass of $5000\ \text{kg}$. The crane is designed to lift a load of $12.0\ \text{kN}$, and the horizontal distance from the pivot to the load is $17.0\ \text{m}$. At what distance from the pivot must the centre of gravity of the counterweight be placed to maintain equilibrium of the crane?

  • A$0.0408\ \text{m}$
  • B$0.240\ \text{m}$
  • C$4.16\ \text{m}$
  • D$40.8\ \text{m}$

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