Consider the figure shown below to be a fixed cantilevered beam. Assume that the beam is 40 feet in length and supports a point load of 4,000 lbs at the free en. assume x=0 is located at the fixed support and x-L is the location of the point load, as shown in the figure below. a) calculate the external reactions in the beam b) calculate the internal shear forces in the beam and draw the shear force diagram indicating the shear force at x=0, x=10 ft, x-20 ft, x=30 ft, x=40ft. c) assume the cantilevered beam has a rectangular cross-section that is 16 ft (b) by 2 ft (h). Calculate the bending stress in the beam. X H