a The Expert TA| Human- C Solved: Find the net rate of+ LTX TakeTutorialAssignme

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a The Expert TA| Human- C Solved: Find the net rate of+ LTX TakeTutorialAssignment.aspx Class Management Help Chapter 14. Heat and Heat Transfer Methods Begin Date: 11/22017 12:01:00 AMDue Date: 12.9/2017 10:41:00 AM End Date: 12/9/2017 10:41:00 AM (11% Problem 9: Suppose a skier standing in the shade is completely clothed in white (head to foot, including a ski mask), with clothes that have an emissivity of 0.200 and a surface temperature of 10.5°C. The surroundings are at14°C and her surface area is .55 m Assignment Status Click here for detailed view Find the net rate of heat transfer, in watts, via radiation from the skier Grade Sumar 6% 94% Problem Status sin0 cotanasinacos0 atan acotansinh) cosh tanh) cotanh) cosO Completed Completed Completed Partial Submissions Allempls remaining: 8 detailed view 3 per attempt) 3% Degrees O Radians CKSP DEL CLEAR 3% Completed Completed Partial Partial Submit I give up Hints: 1 % deduction per hint. Hints remaining: Feedback: deduction per feedback. 4.35 PM lype here to search 11/21/2017 7

Explanation / Answer

q = (Th4 - Tc4) Ac                                   

where

= 0.2

= 5.6703 10^-8 W/m2K4

Th = hot body absolute temperature (K) = 283.5 K

Tc = cold surroundings absolute temperature (K) = 259 K

Ac = area of the object (m2) = 1.55 m^2

Now

q = (Th4 - Tc4) Ac = 0.2*5.6703 10^-8*(283.5^4 – 259^4)*1.55 = 34.45 W

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