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7) a) What is the energy emitted in 1 minute from a black coffee mug which...

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Physics

7) a) What is the energy emitted in 1 minute from a black coffeemug which has a radius of 4 cm and height 6 cm and temperature of70 Fahrenheit. What will the answer be if the coffee mug is at 200Fahrenheit?

b) Now, assume the mug is completely filled with creamed coffee.Assume both of their temperatures are initially at 200 Fahrenheitand the atmospheric temperature is 70 Fahrenheit. How long will ittake each one to reach 71 F ignoring the transfer of heat to eachother by conduction? (Take the density of the coffee to be 1.1g/cm3 , its specific heat to be .95 cal/g.C and the mass of the cupto be 200 grams and its specific heat to be .4 cal/g.C. Also, takethe emissivity of the creamed coffee to be

Answer: a) E = 512.84 Joules, E = 1233.92 Joules b) tcoffee =190.8 hrs, tcup = 3.64 hrs

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3.8 Ratings (381 Votes)
According to Stefans Law the rate of heat energy emmited where e emissivity A surface area T temperature inKelvina t 1 min 60 se 1 for    See Answer
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