Question

Heat and thermodynamics.

Please help with all parts for question 4.

Problem4: Railroad tracks are made f om segmentsL=81mlogat7-20°C. whenthe acks are laid, the eng er of width / between adjacent segments to allow for thermal expansion. The coefficient of linear expansion is a - 12x 1 engineers design the tracks to withstand temperatures of Te-39.5 degrees. s leave gaps 0% ec and Part (o) Enter an expression, in terms of given variables, for the minimum gap distance / the engineers must leave for a tack rated at temperature Te. Expression Select from the variables below to write your expression. Note that all variables may not be required. α, β, 0, d, g, h, і, j, k, L, m. P, t, T,,T, Part (b) What is the minimum gap distance in meters? Numeric :A numeric value is expected and not an expression. Part (e) Suppose the engineers forgot to add the gaps at the beginning of 15 segments. How much longer, in meters, would the track be at T.? Numeric :A numeric value is expected and not an expression AL

Answer 1

segment . a) The using linear expansion minimum gap = expansion e= LAOS (e=La (Tc-T) in a AT=[- b) putting L = 8 m, Te = 39. Sc 1 2 1 2000 minimum a = 81x12 X 166 (39.5-2o)= 0.0190m gup = 15 (0.0190) = 0.285m OL= 15LC (Tc -T) 4 is segments