6: Consider a rigid steel beam of length L = 10.5 m and mass mb = 412 kg resting on two supports, one at each end. A worker of mass mw = 79 kg sits on the beam at a distance x from support A. Refer to the figure, though note that it is not drawn to scale. show answer No Attempt 33% Part (a) Enter an expression for the force support B must exert on the beam in order for it to remain at rest, in terms of defined quantities, x, and g