a.Determine the power & energy of this system.

Frequency Response Discuss the importance of Nyquist plot technique in control systems.

== Consider the signal in Figure 1.11(a). It starts from = 0 and ends at = 2 and is said to have time duration 2. (a) Plot x(21). What is its time duration? (b) Plot x(0.51), What is its time duration? (c) Show that if a > 1, then the time duration of x(at) is smaller than that of x(t). This speeds up the signal and is called time compression. (d) Show that if 0 < a < 1, then the time duration of x(at) is larger than that of x(t). This slows down the signal and is called time expansion.