Problem 4Assume that you can treat the rate at which a human body loses energy as a blackbodyproblem. The approximate surface area of a human body is 1.4 m² and body temperature is33°C. Calculate this heat loss in a warm room (25ºC) and calculate again for outside (10°C).Answer: 70.1 W, 187.1 WProblem 5A gas engine has been running in a closed garage, resulting in a CO level of 600ppm. Uponopening the door, turbulent mixing begins. If the door is 3m wide and 2m high, the garage is10m long, and eddy diffusivity is approximated to be 1m²/s, how long will it be before COconcentration has dropped to 100ppm, which is considered safe for brief exposure periods?Answer: 179 seconds (or 3 minutes)

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Assume that you can treat the rate at which a human body loses energy as a blackbody problem. The approximate surface area of a human body is 1.4 m² and body temperature is 33°C. Calculate this heat loss in a warm room (25°C) and calculate again for outside (10°C). Answer: 70.1 W, 187.1 W

Assume that you can treat the rate at which a human body loses energy as a blackbody problem. The approximate surface area of a human body is 1.4 m² and body temperature is 33°C. Calculate this heat loss in a warm room (25°C) and calculate again for outside (10°C). Answer: 70.1 W, 187.1 W

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter14: Heat And Heat Transfer Methods

Section: Chapter Questions

Problem 62PE: The Sun radiates like a perfect black body with an emissivity of exactly 1. (a) Calculate the...

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Concept explainers

Blackbody

Q.5 A blackbody radiates how much energy when the temperature of the body is elevated?

Question

Problem 4
Assume that you can treat the rate at which a human body loses energy as a blackbody
problem. The approximate surface area of a human body is 1.4 m² and body temperature is
33°C. Calculate this heat loss in a warm room (25ºC) and calculate again for outside (10°C).
Answer: 70.1 W, 187.1 W
Problem 5
A gas engine has been running in a closed garage, resulting in a CO level of 600ppm. Upon
opening the door, turbulent mixing begins. If the door is 3m wide and 2m high, the garage is
10m long, and eddy diffusivity is approximated to be 1m²/s, how long will it be before CO
concentration has dropped to 100ppm, which is considered safe for brief exposure periods?
Answer: 179 seconds (or 3 minutes)

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