Additional Problems (Problem 83)

A 4.0-kg particle moves in a circle of radius 2.0 m. The angular momentum of the particle varies in time according to $l=5.0t^2.$ (a) What is the torque on the particle about the center of the circle at $t=3.4\text{s}$? (b) What is the angular velocity of the particle at $t=3.4\text{s}$? Select the answer to part (a).