Hanging Cable


An electric cable company is replacing the
old cable in Dallas. Without the supporting steel cable, the electric
cable that hangs between two poles form an
arc because of the gravity. In the summer, the
cable sinks for about 5 cm due to temperature, how much does the cable elongate?
What is known:
 The distance between the two poles, L, is 10 meters.
 The distance between the lowest point of the arc and the line of
the top of the two poles, u, is 60 cm.
 The mathematics formula to calculate the length of
the cable, s, is
