how can we say that torque is equal to power / angular velocity though we know that torque is equl to I x (change of angular velocity over time ). and how can we relate torque to (angular velocity) , as we know that a rotating gear at constant angular velocity has no torque on it or bettter saying the sum of all torques on it are equal to zero, so how can we say that torque is equal to the power of the rotating gear over the constant angular velocity ???? arent we contradicting ourselfs ?? how can a torque exist on a constant angular velocity rotating gear ???? I am confused ??