Willis Tower Renovation Creates Stunning Indoor, Outdoor Public Spaces

SOLVED: Suppose the Willis tower has an elevator that is visible fromthe outside of the building. The angle of elevation from anobserver at street level is the angle between the ground and a thestraight line of sight connecting the observer to the position ofthe elevator car. Suppose you are standing 500 ft away from thebase of the elevator, and observe the elevator descending at a rateof 26 ft/ sec. At what rate is the angle of elevation changing whenthe elevator is 700 ft above ground level?

Willis Tower getting new elevators: Here are the ups and downs