Copper, brass and steel rods are welded to form a ?. The cross
sectional area of each rod is 2.00 ??2. The free end of
the copper rod is held at 100.0 ° ?; and the free ends of the brass
and steel rods, at 0.0 ° ?. Suppose there is no heat loss from the
sides of the rods, the lengths of which are: copper, 13.0 ??;
brass, 18.0 ??; steel, 24.0 ??. a) What is the temperature of...