Longitudinal 80822

How does the rail lengthen when the temperature changes from -30°C to 30°C if it is 25 m long at 0°C? The temperature coefficient of longitudinal expansion is 12.10na-6Kna-1.

Correct answer:

Δ =  0.0181 m

Step-by-step explanation:

α=12.10 1061.21105 1/K l0=25 m t0=0 °C  t1=30 °C t2=30 °C  l1=l0 (1+α (t1t0))=25 (1+1.21105 ((30)0))24.9909 m l2=l0 (1+α (t2t0))=25 (1+1.21105 (300))25.0091 m Δ=l2l1=25.009124.9909=0.0181 m



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