Steel railroad rails 10 m long are laid with end-to-end clearance of 3 mm at a temperature of 15'C. (a) At what temperature will the rails just come in contact? (b) What stress would be induced in the rails at that temperature if there were no initial clearance? Use a 11.7 x 10-/C and E= 200 GPa.

Steel railroad rails 10 m long are laid with end-to-end clearance of 3 mm at a temperature of 15°C. (a) At what temperature will the rails just come in contact? (b) What stress would be induced in the rails at that temperature if there were no initial clearance? Use a = 11.7 x 106 /°C and E = 200 GPa.

A steel I-beam has a web that is 17inches tall and 0.19inches thick. If the max shear in the beam is 6kips, what is the approximate max shear stress in the beam in psi? Type your answer...