A heated pool has a thermometer in it$,$ which sits on the bottom of the pool and has a density

of $994$ kg$/$m$3.$ The initial temperature of the pool is $400$ C$,$ and the water has a density of $992$

kg$/$m$3.$ What final temperature would you need to cool the pool to such that the thermometer will

float to the top? You can assume that the thermometer does not thermally expand or contract.

The thermal coefficient of volume expansion for water is $210$ x $106$ K$-1.$

A$.21\mathrm{.}20$ C

B$.22\mathrm{.}50$ C

C$.36\mathrm{.}70$ C

D$.25\mathrm{.}50$ C

E$.30\mathrm{.}40$ C