Consider the continuous-time linear time-invariant system with transfer-function:
g(s) =1 / s+1
answer the following questions:
a) what is the differential equation associated with the above transfer-function?
b) calculate the poles and zeros of g(s).
c) is g(s) asymptotically stable?
d) use the bilinear transformation (aka tustin transformation)
s = 2/ts z−1/z+ 1
to calculate the corresponding discretized transfer-function gd(z)

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit. explain why the pneumatic piston stumbles when it hits an obstacle.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.