A simple pin-connected truss is loaded and supported as shown in Figure P16.13. All members of the truss are aluminum [E = 10,000 ksi] pipes with an outside diameter of 4.00 in. and a wall thickness of 0.226 in. Consider all compression members and determine the minimum factor of safety for the truss with respect to failure by buckling. 12 kips E 8 ft 12 kips D B 6 ft 6 ft 7 kips 5 kips