Question

10 pts Question 17 Two bars, A and Beach of length 2.3m and cross-sectional area 1.4 m., are placed end to end as shown in the figure. The thermal conductivities of the bars are 450 W/mK) and 905 l/s.m.K), respectively. The left end of bar Ais maintained at 373 Kwhile the right end of Bis maintained at 273 K. What is the temperature at the interface between A and B? Please round your answer to the nearest whole number B 373 K 273 K 10 pts Question 18 The coefficient of linear expansion of steel is 12 x 10 CArailroad track is made of individual ralls of steel 1.32 kom in length, By what length would these rails change between a cold day when the temperature is 18 °C and a hot day at 34°C? Please express your answer in cm.

Answer 1

give os 17 $ P1 TI B 72 = 273k 7:373K 68.3m 12-3m A = 1.4m² MK) S.mk K = uso far A K = Gos I ( 1 ) J.mk at seady state > Steady stato (T.-TI) I - T₂) = 8 yo Ä A ke (450) [373-77] 905[/7 773 185.4696- 45071 es T-473 aos T 5.306.2103k +