Answers: 1
![l_{f} = l_{o}\cdot [1+\alpha \cdot (T_{f}-T_{o})]](/tpl/images/1391/8007/0863d.png)
(1)
- Longitud inicial de la varilla, en metros.
- Coeficiente de dilatación, en 
.
- Temperatura inicial de la varilla, en grados Celsius.
- Temperatura final de la varilla, en grados Celsius. 
, 
, 
y 
, entonces la longitud final de la varilla es:![l_{f} = (1.20\,m)\cdot \left[1 + \left(1.4\times 10^{-5}\,^{\circ}C^{-1}\right)\cdot (100\,^{\circ}C-18\,^{\circ}C)\right]](/tpl/images/1391/8007/ceb36.png)
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. Una varilla de cobre de coeficiente de dilatación 1,4*10-5 °C -1 , tiene una longitud de 1.20 metr...
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