A building made with a steel structure is 565 m high on a winter day when the temperature is 0◦F. How much taller is the building when the temperature is 103◦F? The linear expansion coefficient of steel is 1.1 × 10−5 ( ◦C)−1 . Answer in units of cm.

Respuesta :

To solve this problem we apply the thermodynamic equations of linear expansion in bodies.

Mathematically the change in the length of a body is subject to the mathematical expression

[tex]\Delta L = L_0 \alpha \Delta T[/tex]

Where,

[tex]L_0 =[/tex] Initial Length

[tex]\alpha =[/tex] Thermal expansion coefficient

[tex]\Delta T =[/tex] Change in temperature

Since we have values in different units we proceed to transform the temperature to degrees Celsius so

[tex]0\°F \Rightarrow (0-32)*\frac{5}{9} = -17.77\°C[/tex]

[tex]103\°F \Rightarrow (103-32)*(\frac{5}{9})= 39.44\°C[/tex]

The coefficient of thermal expansion given is

[tex]\alpha = 1.1*10^{-5}/\°C[/tex]

The initial length would be,

[tex]L_0 = 565m[/tex]

Replacing we have to,

[tex]\Delta L = L_0 \alpha \Delta T[/tex]

[tex]\Delta L = (565)(1.1*10^{-5})(39.44-(-17.77))[/tex]

[tex]\Delta L = (565)(1.1*10^{-5})(39.44-(-17.77))[/tex]

[tex]\Delta L = 0.355m[/tex]

This means that the building will be 35.5cm taller