A tensile force of 4200 lbs is applied to a 9 feet long 8515 Brass rod. An elongation of 0.36 inch is measured on the rod. Using true stress and true strain relationships compute the diameter of the rod. For 8515 Brass k=58000 psi, and n=0.34. A 300 mm wide 25 mm thick steel strip is fed through a rolling mill. The roller radius is 250 mm and the output thickness is 22 mm at a roll speed of 50 RPM. For the steel material K=275 MPa and n=0.15. Calculate the required roll motor horsepower.