Question

Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth, she generates 60 J/kg worth of heat. What is the temperature increase? The mass of tissues warmed is only 0.100 kg, mostly in the palms and fingers, with c = 3500 J/kg 0C.
0.750 0C


0.257 0C


0.120 0C


0.171 0C

Answer 1

• Q=mc∆T

Put values from question

• 60=0.1(3500)∆T
• 60=350∆T
• ∆T=6/35
• ∆T=0.171°C