Question $18$

$10$ pts

Two isolated systems with different temperatures are connected via a long metal rod. The metal rod conducts heat between the two systems at a rate of $50ca\frac{l}{s}.$ What will happen to the rate of the heat flow, if the length of the metal rod is elongated $2$ times the original distance as well as increasing the cross$-$sectional diameter by $3$ times?

No need to write the unit. Please write the answer in one decimal place. $($e$.$g$.1\mathrm{.}234$ should be written as $1\mathrm{.}2).$