A uniform meter stick is in static rotational equilibrium when a mass of 220 g is suspended from the 5.0 cm mark, a mass of 120 g is suspended from the 90 cm mark, and the support stand is placed at the 40 cm mark.  What is the mass of the meter stick?

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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.