When the hand is holding the 5-lb stone, the humerus H, assumed to be smooth, exerts normal forces and on the radius C and ulna A, respectively, as shown. If the smallest crosssectional area of the ligament at B is 0.30 in2, determine the greatest average tensile stress to which it is subjected.

When the hand is holding the 5-lb stone, the humerus H, assumed to be smooth, exerts normal forces Fc and Fa on the radius C and ulna A, respectively, as shown. If the smallest crosssectional area of the ligament at B is 0.30 in^2, determine the greatest average tensile stress to which it is subjected.