Two wooden planks each in thick and 1 / 2 in. thick and 9 in. wide, are joined by the dry mortise joint shown. knowing that the wood used shears off along its grain when the average shearing stress reaches 1.20 ksi, determine the magnitude p of the axial load that will cause the joint to fail. two wooden members of uniform rectangular cross section of sides a = 100 mm and b = 60 mm are joined by a simple glued joint as shown. knowing that the ultimate stresses for the joint are sigma u = 1.26 mpa in tension and tau u = 1.50 mpa in shear and that p = 6 kn, determine the factor of safety for the joint when (a) alpha = 20degree, (b) 35degree, (c) alpha = 45degree. for each of these values of alpha, also determine whether the joint will fail in tension or in shear if p is increased until rupture occurs.

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