Chapter 14, Problem 35PE

(a) A firewalker runs across a bed of hot coals without sustaining burns. Calculate the heat transferred by conduction into the sole of one foot of a firewalker given that the bottom of the foot is a 3.00-mm-thick callus with a conductivity at the low end of the range for wood and its density is $\text{3}00\text{ kg}/{\text{m}}^{\text{3}}$. The area of contact is $\text{25}.0{\text{ cm}}^{\text{2}}$, the temperature of the coals is $\text{7}00°\text{C}$, and the time in contact is 1.00 s.

(b) What temperature increase is produced in the $\text{25}.0{\text{ cm}}^{\text{3}}$ of tissue affected?

(c) What effect do you think this will have on the tissue, keeping in mind that a callus is made of dead cells?