Answer to Question #200914 in Physics for James

Question

1. Consider a person sitting nude on a beach in Florida. On a sunny day, visible radiation energy from the sun is absorbed by the person at a rate of 30 kcal/h or 34.9 W. The air temperature is a warm 30 ℃ and the individual’s skin temperature is 32 ℃. The effective body surface exposed to the sun is 0.9 m2.

(4 pts.) Find the net energy gain or loss from thermal radiation each hour.

(4 pts.) If there is a 4 m/s breeze, find the energy lost by convection each hour.

(4 pts.) If the individual’s metabolic rate is 80 kcal/h (93.0 W) and breathing accounts for a loss of 10 kcal/h (11.6 W), how much additional heat must be lost by evaporation to keep the body core temperature constant?

(3 pts.) How would you suggest that he loses this energy? Explain your answer clearly and convincingly.

Answer 1

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