For a permanent bolted assembly with 12 bolts, the stiffness of each bolt is kb = 3 bf/in and the stiffness of the members is km = 10 bf/in per bolt. An external load of 60 kips is applied to the entire joint. Assume the load is equally distributed to all the bolts. It has been determined to use 5/8 in-13 UNC grade 7 bolts. (a) (2 points) Determine the yielding factor of safety. (b) (2 points) Determine the factor of safety based on joint separation. (c) (2 points) Determine the load factor for overload.

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w