Why did a great span, more than half a mile in length and weighing tens of thousands of tons, spring to life in a relatively light wind? and how did slow, steady, and comparatively harmless motions suddenly become transformed into a catastrophic force? to answer these questions engineers began applying the science of aerodynamics to bridge designs determine the meaning of the underlined word in the passage above a. study of wind tunnels c. study of movement of air b. study of bridge motion d. study of cable suspension

Read the excerpt from the iroquois constitution. all lords of the five nations confederacy must be honest in all things. . it shall be a serious wrong for anyone to lead a lord into trivial affairs, for the people must ever hold their lords high in estimation out of respect to their honorable positions. what is the main idea of this excerpt? members of the five nations confederacy should know how to show respect to their lords. the lords of the five nations confederacy hold high-ranking positions. the people of the five nations confederacy deserve respect and should be held in high esteem. the lords of the five nations confederacy should act honorably and be revered.