A railroad track made of steel has a length Ltrack = 30 m when the air temperatures 0 °C. The coefficient of linear expansion for steel is: asteel = 11 x 10-6 (°C)-1 The Youngs modulus of steel is: Y steet = 2.2 x 1011 Pa It is necessary to: calculate the track length on a hot summer day when the temperature at the level of the track is 40 °C. suppose the track is nailed down so that it can't expand, determine the magnitude of thermal stress induce in the track due to the temperature change.