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Body Heat Loss/Caloric Usage

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Please help with the following problem. Provide step by step calculations.

1. The average human body has a temperature of 30 degrees celcius, a skin surface are of 1.20mt^2 and an emissivity of 1.0

a. If the surrounding temp is 20degree celcius, the body's net rate of heat loss due to radiation is -------- watts

b. How many food caloried must be consumed per day to maintain that body temperature if only radioactive heat losses are considered?

2. Three moles of an ideal gas are heated at constant temp of 1.5 atm from T= 27 degree c to 177 degree

a. The work done by the gas is----------.

3. A 0.400 kg block of ice at -20 degree celcius is converted to steam at 100 degree celsius.
a. The amount of heat required is -------J or ---------Calories

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Solution Summary

Brief calculations show how to find a human's heat loss and the calories required to maintain heat in these questions of emissivity. The explanation provides step by step calculations.

Solution Preview

1. a. Q = sigma*A*Delta T^4 = 5.67*10^-8*20*10^4 = 113.4*10^-4 = 0.01134 ...

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