A.) In exercising, a weight lifter loses 0.123 kg of water through evaporation,

Question

A.) In exercising, a weight lifter loses 0.123 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. The work done in lifting weights is 1.45E+5 J. Assuming that the latent heat of vaporization of perspiration is 2.43E+6 J/kg, find the change in the internal energy of the weight lifter.

B.) A gas, while expanding under isobaric conditions, does 484 J of work. The pressure of the gas is 1.67E+5 Pa, and its initial volume is 1.38E-3 m3. What is the final volume of the gas?

Explanation / Answer

Energy added from the work is

1.4E+5

Removed from sweat

0.123*2.42E+6

the change in internal energy is

1.4E+5-0.123*2.42E+6

-1576600 J

1 kcal=4186

/15766004186

376.6 kCal

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