The Tangential Force F Shown in Figure Below Is Applied

The tangential force F shown in figure below is applied to a 2-kg disc is allowed to rotate about an axis through its center.The magnitude of this tangential force is given in the graph of F vs.Angular Position.With the disc at rest initially and ignoring frictional torque,the disc's angular velocity after one full rotation is -31.4 rad/sec.What is the diameter of the disk?

A) 12.7 cm
B) 200 cm
C) 400 cm
D) 9.65 cm
E) 19.2 cm

Correct Answer:

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