Text: made up of steel and concrete such that its combined linear expansion coefficient is 11.5 * 10^-6 per °C (°C), bridge sections such that no single expansion joint can be more than 4 cm long. The bridge is 2500 m long. It is built. The temperature range is from -50°C to 50°C.
What is the overall maximum expansion/contraction the bridge will have? (What is the maximum Δl?)
b) If the bridge starts with and ends with an expansion joint, how long could each section of the bridge be between expansion joints?