Q 17.26 What air tempreture will fell twice as warm as 0 F? Q 17.36 Even though
ID: 2057325 • Letter: Q
Question
Q 17.26 What air tempreture will fell twice as warm as 0 F?
Q 17.36 Even though steel has a relatively low linear expansion cooficient, the expansion of steel railroad tracks can potintially create a significant problems on very hot summerdays. To accomodate for thermal xpansion ,agap is left between consecutive sections of the track.If each sections is 25.0 m long at 20.0 C and the gap betwwen sections is 10.0 mm wide ,what is the highest tempreture the tracks can take before the expansion creates compressive forces between sections?
Explanation / Answer
ANSWER 17.26
0 F = (0 - 32) * 5/9 + 273.15 K = 290.9278 K
twice the temp = 2* 290.9278 K = 581.856 K
= ( 581.856 - 273.15) * 9/5 + 32 F
= 587.67 F
ANSWER 17.27
L / L = T
L = 25 m L = 10 /1000 m for steel = 13 * 10-6 K^-1
therefore T = 30.77 C
maximum temperature = 30.77 + 20 = 50.77 C
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