Answers: 3
![A_{f} = w\cdot l \cdot [1 + 2\cdot \alpha\cdot (T_{f}-T_{o})]](/tpl/images/1376/9698/88229.png)
(1)
- Ancho de la placa, en centímetros.
- Longitud de la placa, en centímetros. 
- Coeficiente de dilatación, en 
.
- Temperatura inicial, en grados Celsius.
- Temperatura final, en grados Celsius. 
, 
, 
, 
and 
, entonces el área de la placa a la temperatura final:![A_{f} = (65\,cm)\cdot (78\,cm)\cdot \left[1+\left(17\times 10^{-6}\,\frac{1}{^{\circ}C} \right)\cdot (400\,^{\circ}C-20\,^{\circ}C)\right]](/tpl/images/1376/9698/dbb5b.png)
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Una placa de cobre a 20°C tiene unas dimensiones de 65cm x 78 cm. Encuentra el área de la placa a 40...
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