Chapter 28, Problem 43P

(a)

To determine

Proof that retarding force is $F=\left(\frac{B^2{\mathcal{l}}^{2}v{\cos }^2\theta }{R}\right)$ .

(b)

To determine

Proof that the terminal speed of the rod is $v_t=\frac{mgR\sin \theta }{B^2{\mathcal{l}}^2{\cos }^2\theta }$ .