A window has a glass surface of 1600 cm^2 and a thickness of 3.0 mm. A) Find the

Question

A window has a glass surface of 1600 cm^2 and a thickness of 3.0 mm. A) Find the rate of energy transfer by conduction through this pane when the temperature of the inside surface of the glass is 70degree F and the outside temperature is 90degreeF. Assume the thermal conductivity of window glass is 0.8 J/sm degree C. B) find the energy transfer for the same inside temperature and an outside temperature of 0degreeF. Given: sigma = 5.67 times 10-8 W/m^2 middot K^4. A child has a temperature of T = 101degreeF. If her total skin area is 2.00 m^2, find the energy loss per second due to radiation, assuming the emissivity epsilon = 1. (Assume the room temperature is 70degree F.)

Explanation / Answer

problem 4;

Given that

thickness l=3*10^-3 m

area A=0.16 m^2

temperature difference =90-70=20 F=-6.7 C

thermal conductivity k=0.8

step;2

now we find the energy loss per sec

the energy loss per sec =0.8*-6.7*0.16/3*10^-3

=-285.9 J/s

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problem 5

Given that

area A=2 m^2

temperature T=101F=38.3 C

emissivity e=1

step;2

now we find the power

power =1*2*5.67*10^-8*38.3^4

=0.24 W

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