Q3). A torque of 30.7 Nm is applied to a copper rod, 250 mm long and 10 mm diameter. a). Assuming a modulus of rigidity of 44 800 MPa, calculate the angle of twist. b). What should the diameter of the rod be if the angle of twist is limited to 3.5 degrees Q5). Mechanical tests have been conducted on an engineering polymer called nylon-66 which established the following results: Young's Modulus: E = 2750 MPa Modulus of Rigidity: G 975 MPa G = E/ 2( 1 + v) where v is Poisson's Ratio The theoretical relation was then used to calculate Poisson's ratio for this material. What was the answer ? 4 marks