Answered: Rubbing your hands together warms them…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Rubbing your hands together warms them by converting work into thermal energy.

a. If a woman rubs her hands a total of 19 times (forward and backwards count separately), at a distance of 7.75 cm per rub, and with an average frictional force of 39 N, what is the temperature increase of her hands, in degrees Celsius? The mass of tissues warmed is only 0.100 kg, mostly in the palms and fingers, and the heat capacity of her hands is 3500 J/(kg⋅°C).

Substances
Solids
Aluminum
Concrete
Copper
Glass
Human Body (37°C)
Iron, steel
Liquids
Water
Mercury
Specific heat (c)
J/kg C kcal/kg.C
900
0.215
840
0.20
387
0.0924
840
0.20
3500
0.83
452
0.108
4186
139
1.000
0.0333

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