Three rubber bands are shown before and after being stretche…

Three rubber bands are shown before and after being stretched. Before stretching, bands A, B and C have lengths of 90 mm, 105 mm, and 160 mm, respectively. After stretching, band A has a length of 105 mm, while bands B and C each have a length of 210 mm. Determine the minimum normal strain in the bands.

Before an automotive engine is started, its timing belt has…

Before an automotive engine is started, its timing belt has a length of 39.00 in. and a temperature of 75°F. At the engine operating temperature of 220°F, it is determined that the belt has elongated to 39.04 in. What is the coefficient of thermal expansion of the belt?