Asecond-order mechanical system has the transfer function :

g(s)= 1 = y(s) 0.15s2 + 1.4s + 128 u(s)

the system is initially at rest when a step-input force u(t) = 5u(t) n is applied.

a. show that the transient response will oscillate before reaching a steady-state response.

b. determine the oscillation frequency of the transient response in hz.

c. estimate the number of oscillations (cycles) before the system reaches steady state.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Atmospheric air has a temperature (dry bulb) of 80° f and a wet bulb temperature of 60° f when the barometric pressure is 14.696 psia. determine the specific humidity, grains/lb dry air. a. 11.4 c. 55.8 d. 22.5 b. 44.1

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed