A tensile force of 8 kN is applied to the ends of a solid bar of 7.35 mm diameter. Under load, the diameter reduces to 6.00 mm. Assuming uniform deformation and volume constancy, (a) determine the engineering stress and strain, (b) determine the true stress and strain, (c) if the original bar had been subjected to a true stress of 425 MPa and the resulting diameter was 6.00 mm, what are the engineering stress and engineering strain for this condition?