Helium at 68 °f and 14.7 psia in a large tank flows steadily and isentropically through a converging nozzle to a receiver pipe. the cross-sectional area of the throat of the converging passage is 0.05 ft2. determine the mass flowrate through the duct if the receiver pressure is (a) 10 psia, (b) 5 psia. sketch temperature– entropy diagrams for situations (a) and (b).

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost