$3\mathrm{.}20$ A $10-kg$ block of copper is initially at $100C.$ It is thrown in a very large lake that is at $280K.$ What is the entropy change of the copper? What is the entropy change of the universe?

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Solutions: $,S_{sys}=-1\mathrm{.}024k\frac{J}{K}$;$S_{\text{s}\text{u}\text{r}\text{r}}=1\mathrm{.}186k\frac{J}{K}$

By estimating that

$c_P$~~$c_V$

for solids $($p$71)$

Only appropriate for small changes.

We knew this is not very accurate since Ch $1!$

$>$ Does the copper contract upon cooling?

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