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Air at 1 bar and 20 degrees C is compressed isentropically to 20 bar pressure. For both a) and b) assume that air is an ideal gas.
a) Calculate the final temperature if the specific heat can be considered to be a constant.
b) Calculate the final temperature if the specific heat is variable.
Sketch the frequency response of the system. Overlay the frequency spectrum of the excitation and as you start the system up, increasing Ω from 0 to 60 rpm, what speeds are most likely to excite large amplitude response? Why?
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