Avehicle has individual wheel suspension in the form of helical springs. the free length of the spring lf = 360 mm and the solid length ls = 160 mm at a compressive force of 5000 n. the shear modulus g = 80 gpa. use d/d = 9 and calculate the shear stress for pure torsion of the spring wire. the spring ends are squared and ground. find na, p, d, d, and tmax. na=8.43 coils, p=39.1 mm, d=15.3 mm, d= 138 mm tmax=486 mpa.

Air at a pressure of 1atm and a temperature of 40 c is in parallel flow over the top surface of a flat plate that is heated to a uniform temperature of 120 c. the plate has a length of 0.40m (in the flow direction) and a width of 0.15m. the reynolds number based on the plate length is 50, 000. what is the rate of heat transfer from the plate to the air? if the free stream velocity of the air is doubled and the pressure is increased to 10 atm what is the rate of heat transfer?