Assuming your skin temperature is 37.2 %u2218 C and the temperature of your surr

Question

Assuming your skin temperature is 37.2 %u2218C and the temperature of your surroundings is 22.4%u2218, determine the length of time required for you to radiate away the energy gained by eating a 308-Calorie ice cream cone. Let the emissivity of your skin be 0.915 and its area be 1.24m2 .
t = ?
h Assuming your skin temperature is 37.2 %u2218C and the temperature of your surroundings is 22.4%u2218, determine the length of time required for you to radiate away the energy gained by eating a 308-Calorie ice cream cone. Let the emissivity of your skin be 0.915 and its area be 1.24m2 .
t = ?
h

Explanation / Answer

P radiation = e* ( stefan's constant)(A)(T^4-T^4)



P radi = (0.915)*(5,6703*10^-8)(1.24)(310.2%u2026
P radi = 112 watts=112 J/s=403142 J/h

295 K Cal = 295000 cal (1 cal=4.186 J)
=1234870J

total number of hours is 1234870 (J)/403142(J/h)==> 3.06hr

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