A 40kg dog and a 30kg cat are sitting on either end of a long board balanced precariously on a pivot under the middle of the board. The dog is sitting 3m from the pivot. How far away from the pivot must the cat be in order for the system to maintain equilibrium???

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.