(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 300 kg/m³. The area of contact is 25.0 cm², the temperature of the coals is 700°C, and the time in contact is 1.00 s.

(b) What temperature increase is produced in the 25.0 cm³ 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?