3. The figure shows three forces acting on a pin-supported rectangular plate at points A, B, and C. Use the scalar method of computing moments in this problem. a. Compute the moment of the force at A about D and write your answer in vector form (note: you can use the scalar method to find the moment). b. Compute the magnitude and orientation (0 < < 180°) of the smallest force FB that creates the same moment about D that you found in part (a). c. If Fg = = 20 lb and 8 = 30°, compute the magnitude of the horizontal force Fc that makes the resultant moment of these three forces about D equal to zero. 16 in -24 in 30 in 23° 55 lb B 20 in C FB Fc e

In structural engineering, a beam is a component made of a variety of materials (including steel alloys, and wood) that can resist loads applied laterally to the beam axis. Members, elements, rafters, shafts, and purlins are all terms used to describe be…