For this given problem, if the yield strength is now 45 ksi, using Distortion Energy Theory the material will and using the Maximum Shear Stress Theory the material will a. fail / not fail
b. fail /fail
c. not fail/fail
d. not fail/not fail

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3