Western Sydney Solar Team are designing a frame using Steel as the main material. They know the linear coefficient of thermal expansion of aluminium is 9 106 (C)1 and the modulus of elasticity is 210 GPa. They use aluminium rods with length of 0.5 m, which are stress free at 25 C. On a hot summer day when the chassis rods are heated from 25 C to 38 C, how much change in length will a rod experience On a cold winter day when the rods are cooled from 25 C to 5 C while their ends are maintained rigid to the frame, what type and magnitude of stress will develop?