Problem 5. (40 pts)
A rectangular bar is loaded as shown in the figure.
[a = 4 ft, b = 6 ft, c = 4 in., P = 14000 lb, t = 2 in., h = 6 in.]
a. Determine the normal stress due to do the axial force at the cross section A-A.
b. Determine the normal stress caused by the bending moment at section A-A.
c. What is the minimum tensile stress at section A-A?
d. Determine the maximum tensile stress developed over section A-A.