Question

The height of the Washington Monument is measured to be 170 m on a day when its temperature is 35.0°C. What will the change in its height be on a day when its temperature fails to -18.0°C? Although the monument is made of limestone, take the thermal coefficient of expansion to be that of marble.

Answer 1

The deformation is 0.088289 m

The final height of the monument is 170-0.088289 = 169.911702 m

Step-by-step explanation:

Thermal coefficient of marble varies between (5.5 - 14.1) ×10⁻⁶/K = α

So, let us take the average value

(5.5+14.1)/2 = 9.8×10⁻⁶ /K

Change in temperature = 35-(-18) = 53 K = ΔT

Original length = 170 m = L

Linear thermal expansion

`(\Delta L)/(L) = \alpha\Delta T\\\Rightarrow \Delta L=(\alpha\Delta T)/(L)\\\Rightarrow \Delta L=9.8* 10^(-6)* 53* 170`

The deformation is 0.088289 m

The final height of the monument is 170-0.088289 = 169.911702 m (subtraction because of cooling)