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.