E9.28 A unity feedback system has the loop transfer function

(a) Determine the phase gain for the system.

(b) Use the phase margin to estimate the damping ratio and predict the percentage overshoot.

(c) Calculate the actual response for this system and compare the result with the part

(b) estimate.

10 L(s) = Ge(s)G(s) s(s + 0.8)