Two very large parallel plates are maintained at uniform temperatures t1 = 800 k and t2 = 500 k and have emissivity ε1 = 0.2 and ε2 = 0.7, respectively. determine the net rate of radiation heat transfer between the two surfaces per unit surface area of the plates.

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.

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.

What is creep? what is stress relaxation?