A discrete-time system is described by the following difference equation: y[n]-0.9y[n-1]H0.2y[n 2] = x[n] -x(n-1] where x[n] and y[n] are the input and output sequences of the system respectivelv. a) Determine the transfer function H(z) of the system b) Plot the pole-zero diagram. c) Determine the impulse response h[n] of the system. d) Determine the step response s[n] (i. e. an output y[n] when x[n]u[n of the system

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.