Task 1 part A The first task concerns calculation of the expansion of a tie bar when undergoing a rise in temperature. You are also asked to calculate the compressive force that would be exerted on the bar if it is rigidly held so as to prevent it from expanding. A brass tie bar of length 500 mm and diameter 20 mm undergoes a change in temperature from 25 .C to 135 .C. The linear expansivety of brass is 19 x 10-6 .C and its modulus of elasticity is 84 GPa. i) Determine the change of length that takes place. Task 1 part B ii) Determine the compressive force induced in the bar if it is rigidly held and expansion is prevented