Compute diffusion coefficients for the interdiffusion of carbon in both (a) α-iron (BCC) and (b) γ-iron (FCC) at 825˚C. Assume that D0 for the interdiffusion of carbon in α-iron and in γ-iron are 1.1 × 10^-6 and 2.3 × 10^-5 m^2/s, respectively, and that Qd are 80 and 148 kJ/mol, respectively. Answer should be in degrees Celcius.

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

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.