An open-coiled helical spring made up of 10mm diameter wire and of mean diameter 100mm has coils, angle of helix being 15". Determine the axial deflection and intensities of bending and shear stress under an axial load of 500N. Take G as 80Gpa and E as 200Gpa. (12 marks) (c) A hollow alloy tube Am long with external and internal diameter of 40mm and 25mm respectively was found to extend 4.8mm under a tensile load of 60KN. Find the buckling load for the tube with both ends pinned. Also find the safe load on the tube, taking a factor of safety as 5. (10 marks)