Loss and gain Give step-by-step calculation and explanationConsider a person sitting nude on a beach in Florida. On a sunny day, visible radiation energy from thesun is absorbed by the person at a rate of 30 kcal/h or 34.9 W. The air temperature is a warm 30 °C andthe individual’s skin temperature is 32 °C. The effective body surface exposed to the sun is 0.9 m².(Assume this same area for sun absorption, radiative transfer, and convective loss. Is this a goodassumption?)a. Find the net energy gain or loss from thermal radiation each hour. (Assume thermal radiativegain and loss according to the equation 6.51 in Herman and an emissivity of 1.) Answeer a 21kcal/hror 2YD-(4).Eguadion(6.51)- (40 Tin)Eskin Askin (Tskin – Troom)dt= (4 x 5.67 x 10¬8 w/m²–K*x (307 K)³)€skin Aşkin (Tskin – Troom) -(6.52)b. If there is a 4 m/s breeze, find the energy lost by convection each hour. (Use Eq. 6.61 with eq.6.63.) Àns48 kcal /hr or 24W1Equationh.(Tskin – Tair),(6.61)Adthe10.45 – w + 10w0.5(6.63)-c. If the individual’s metabolic rate is 80 kcal/h (93.0 W) and breathing accounts for a loss of 10kcal/h (11.6 W), how much additional heat must be lost by evaporation to keep the body coretemperature constant? Aas = 43 kcal/h or 50wd. How would you suggest that he loses this energy? Explain your answer clearly and convincingly.

Given:- On a sunny day, The visible radiation energy from the sun is absorbed by the person at a…

Answered: Consider a person sitting nude sun is…

Consider a person sitting nude sun is absorbed by the person a the individual's skin temperatu (Assume this same area for sun

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter28: Quantum Physics

Section: Chapter Questions

Problem 3P

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Question

Loss and gain

Give step-by-step calculation and explanation
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 °C and
the individual’s skin temperature is 32 °C. The effective body surface exposed to the sun is 0.9 m².
(Assume this same area for sun absorption, radiative transfer, and convective loss. Is this a good
assumption?)
a. Find the net energy gain or loss from thermal radiation each hour. (Assume thermal radiative
gain and loss according to the equation 6.51 in Herman and an emissivity of 1.) Answeer a 21kcal/hr
or 2YD
-(4).
Eguadion
(6.51)
- (40 Tin)Eskin Askin (Tskin – Troom)
dt
= (4 x 5.67 x 10¬8 w/m²–K*
x (307 K)³)€skin Aşkin (Tskin – Troom) -
(6.52)
b. If there is a 4 m/s breeze, find the energy lost by convection each hour. (Use Eq. 6.61 with eq.
6.63.) Àns
48 kcal /hr or 24W
1
Equation
h.(Tskin – Tair),
(6.61)
A
dt
he
10.45 – w + 10w0.5
(6.63)
-
c. 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? Aas = 43 kcal/h or 50w
d. How would you suggest that he loses this energy? Explain your answer clearly and convincingly.

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