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aidananderson
22.08.2019 •
Physics
Okeep yourself warm in the winter, you heat a solid metal ball and place it on a stand in the center of your room. the ball has a radius of 20.0 cm and an emissivity of 0.790. if your room has a temperature of 15°c, what is the net power radiated by the ball initially, when the ball's temperature is 200°c?
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Ответ:
1.7135 x 10^10 J / s
Explanation:
R = 20 cm = 0.2 m
e = 0.79
To = 15 degree C = 15 + 273 = 288 K
T = 200 degree C = 200 + 273 = 473 K
Energy radiated per unit time = A x e x (T^4 - To^4)
Power radiated = 4 x 3.14 x 0.2 x 0.2 x 0.79 x (473^4 - 288^4)
= 1.7135 x 10^10 J / s
Ответ: