Concrete segments 25 m long are laid at 10C. a) What space is required between two segments if a maximum temperature of 40C is expected in summer? Use: delta(L) = a*L(0)*delta(T) where for concrete, a = 12 x 10^-6 K^-1 b) If the segments touch each other at 40C, what is the stress induced in the concrete if the temperature rises to 45C? Hint: Concrete has a Young's modulus E = 2 x 10^10 N/m^2.