P9.23 A closed-loop system has a loop transfer function

(a) Determine the gain K so that the phase margin is P.M. = 40.

(b) For the gain K selected in part

(a) determine the gain margin of the system.

K = L(s) G(s)G(s) = = s(s+3)(s + 10) (a) Determine the gain K so that the phase margin is P.M. 40. (b) For the gain K selected in part (a) de- termine the gain margin of the system.