### Mechanics of Materials and Critical Loads

A hollow brass rod is pin jointed and loaded in compression as shown. Knowing that the length L = 3 m, outside diameter D = 60 mm, and the wall thickness t = 10 mm Determine the critical load P. Use E = 105 GPa Choose One: 84.8kN 72.4kN 58.8kN 45.2kN Determine the normal stress at the critical load. Choose One: 32.1