Why the balance-point to be in the middle third in experiments with a slide-wire bridge?

After the french and Indian warnative Americans west of the Appalachian mountains? Waterway allowing ships to cross north America from the Atlantic and Pacific Ocean? What things is triangle at home? Which car is named after a river? Who wanted to build the arc de triomphe and why? What is the name of the river when it is unscrambled from fllwaatre? Can there be pigs at the zoo? When did the great barrier reef become a world heritage site? What causes land features like meanders v-shaped valleys and oxbow lakes? What does suspension stayed mean? Did anyone lived after rolling in a barrel off Niagara falls? Can you see a sunrise over the NJ beach? What city is closest to the great wall? Where does the White Nile begins? Who is the only prisoner who swam and escaped Alcatraz? What ocean borders Singapore? How old is mount kilauea? What are the record snowfalls for St. Louis Missouri? By using information about the temperature and salinity of the ocean water oceanographers can determine the -Density? What is the width of the Statue of Liberty?