a fireman of mass 80 kg slides down a pole at constant speed. when he reaches the bottom, 4.2 m below his starting point, how much has thermal energy increased during his slide?

Question

a fireman of mass 80 kg slides down a pole at constant speed. when he reaches the bottom, 4.2 m below his starting point, how much has thermal energy increased during his slide?

A. 2800 J

B. 3300 J

C. 1940 J

D. 980 J

Answer 1

Since energy is not lost but converted from one form to another, the thermal energy gained = potential energy lost. Since the potential energy lost = g*mass*height you can find the thermal energy gained.

r/Charles