Question: At the end of a long race, runners are given a shinyfoil sheet to wear. This stops them cooling down too quickly.Suggest why a runner might cool down too quickly if he doesnot wear a foil sheet? Then explain in brief how the foil sheetreduces heat loss?

After a long race the body temperature of the runner becomes too high as compared to surrounding…

Answered: Question: At the end of a long race,…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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SOLVE STEP BY STEP IN DIGITAL FORMAT The SOLFIES company is dedicated to welding any type of metal, but especially aluminum parts. If the aluminum pieces that are welded come out at 1200°C and to speed up the cooling they are immersed in a tank full of water with a temperature of 0°C. In this case, the heat is transferred from the welded part to the water, causing the temperature to begin to decrease. Taking into account the temperature data of both the piece and the water, in addition to the value of the constant K= 0.02, it is necessary to know how long it takes for the piece to reach a temperature of 20°C in order to handle it and deliver it to the customer. MATH MODEL T'+KT=Tm Solve this differential equation with Euler's numerical method.
For the 21.5-cm thick multilayer assembly as listed below, please estimate the temperature on the interface between material layers 3 and 4 Material layers - counted from the interior side: (1) 1.5 - cm gypsum board; (2) 4.0-cm - concrete of density - 2400-kg/m3; (3) 10-cm of XPS foam; (4) 6.0-cm - concrete of density - 2400-kg/m3 Interior film resistance is Ri = 0.121 m2K/W Exterior film resistance is Re - 0.029 m2K/W Internal temperature +20 degC External Temperature - 20 degC All necessary material properties can be found in the ASHRAE Handbook of Fundamentals, or other sources

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Question: At the end of a long race, runners are given a shiny foil sheet to wear. This stops them cooling down too quickly. Suggest why a runner might cool down too quickly if he does not wear a foil sheet? Then explain in brief how the foil sheet reduces heat loss?