A load of 2000 lb is to be supported from a construction crane by two vertical steel cables for which the Yield Stress in tension is 70 ksi and the Elastic Modulus is 29,000 ksi. Before the load is applied, cable AB is 60 inches long and cable AC is 60.04 inches long. a. Cable AC has a cross-sectional area of 0.02 in2 . Determine the cross-sectional area of cable AB, if the load is to be shared equally between both cables. b. Determine if either of the cables will yield. If so, which one?

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?