10 kip/ft 50 kip · ft А B 5 ft 5 ft - The simply-supported beam above is subjected to a uniformly distributed load and couple moment, as shown. The beam is supported by a pin at A and roller at B. Which of the following best describes the shape of the moment diagram between the midspan of the beam and point B? a) zero b) constant c) linear d) parabolic e) cubic