A Pulley with Radius R Is Free to Rotate on a Horizontal

question 15

Multiple Choice

A pulley with radius R is free to rotate on a horizontal fixed axis through its center.A string passes over the pulley.Mass m₁ is attached to one end and mass m₂ is attached to the other.The portion of the string attached to m₁ has tension T₁ and the portion attached to m₂ has tension T₂.The magnitude of the total external torque, about the pulley center, acting on the masses and pulley, considered as a system, is given by:

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