A 60.0-kg runner expends 335 W of power while running a marathon. Assuming that

Question

A 60.0-kg runner expends 335 W of power while running a marathon. Assuming that 8.00% of the energy is delivered to the muscle tissue and that the excess energy is removed from the body by sweating, determine the volume of bodily fluid (assume it is water) lost per hour. (At 37.0

A 60.0-kg runner expends 335 W of power while running a marathon. Assuming that 8.00% of the energy is delivered to the muscle tissue and that the excess energy is removed from the body by sweating, determine the volume of bodily fluid (assume it is water) lost per hour. (At 37.0 degree C the latent heat of vaporization of water is 2.41 times 106 J/kg.)

Explanation / Answer

Energy=Power*time=335*3600=1206000 J

since 92 %of the energy is delivered to aweting

==> Energy=0.92*1206000=1109520 J

==> m*L=1109520

==> m= 1109520/2.41E6=0.46038 Kg

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