Q3/ A solid steel bar of circular cross section in fig.3 has diameter d 1.5 in , length L= 54 in , and shear modulus of elasticity G= 11.5x 10 psi , the bar is subjected to torques T acting at the ends : (a) If the torques have magnitude T= 250 lb.ft , what the maximum shear stress in the bar ? what is the angle of twist between ends? (b) If the allowable shear stress is 6000 psi and the allowable angle of twist is 2.5 , what the maximum permissible torque? (15 Marks) d= 1.5 in. L = 54 in.