By using alternative method, find the internal forces for each member

Steel rails on a train track are laid with a small gap between them at a temperature of -25 F. The cross-sectional area of each rail is 5 in^2. The steel rails are 40-ft-long. a. When the temperature is increased to 95°F, determine 8. b. Using this gap, what would be the axial force in the rails if the temperature were to rise to 110°F?

Use the method of joints to determine the force in each member of the truss shown in the following problems. State whether each member is in tension or compression. The value of x =25

Problem 3: If the length of all the members is equal on the figure as shown below, determine the force of member AC and BC and state whether it is compression or tension.