The coefficient of thermal expansion of concrete and steel are alpha_concrete = 1.2 x 10-5/C and alpha_steel = 1.1 x 10-5/C, respectively. The length of the steel conforms to the size of the surrounding concrete. If the structure was formed at 10 C, what is the stress in an embedded steel rod when the temperature is 30C? Young modulus for steel is 2.0 x 10^11 Pa. Is the steel under compression or tension?