Question

Question #cdd3a

Answer 1

I found `11.55cm`

Explanation:

We need to consider thermal linear expansion.
In this case I would try to find the coefficient of linear expansion of iron (from literature):

Then we can say that the change in length `Deltal` will be related to the original length `l_0`, the coefficient `alpha` and the change in temperature `DeltaT` as:

`Deltal=alphal_0DeltaT`
or with our data:
`Deltal=11.7xx10^-6*300*(-4-31)=-0.1155m`
]Cooling the tower it shrinks of `0.1155m=11.55cm`