(4) Replace the three forces acting on the frame by a resultant force and a resultant moment at point B. Use the geometric method to determine the moment about B, and point D is the midpoint of bar AB. Ans: R=127+8-16k kips, MB=801 +84 +72k kip-ft 8 kips 16 kips A 14' D 12 kips 12' B

Gina is standing near a building and notices that the angle of elevation to the top of the building is 68. She then walks 72 feet further away from the building and notices that the angle of elevation to the top of the building is now only 51. Find the height of the building. a. 2511 b. 56ft c. 149ft d. l80ft