Q1.
(iv) A hollow shaft (d0 = 2di where d0 and di are the outer and inner diameters, respectively) needs to transmit 20 kW power at 3000 rpm. If the maximum permissible shear stress is 30 MPa, calculate the value of outer diameter of hollow shaft.
(v) The figure below shows a steel rod of 25 mm2 cross sectional area. It is loaded at four points K, L, M and N. Assume E_{\textsteel} = 200 \text GPa. Determine the total change in the length of the rod due to loading.