A structure is made of 2014 aluminum alloy with a tensile yield strength of 276 MPa. The critical point in the structure experiences the state of stress below. Calculate the factor of safety according to the Tresca and von Mises theories. a. σx= 50MPa
b. σy= 0
c. σz= 30 MPa
d. τxy= 20 MPa
e. τyz= 60 MPa
f. τzx= 75 MPa

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?

Determine the stoichiometric and actual air-fuel ratios and the mole flue gas composition for combustion with 15% excess air for raw indiana, pennsylvania raw coal.