and water is cooled uniformly so that the temperature decreases 1.5 degeers C per minutes. At what rate is heat energy being removed? Express answers in watts.
answer is 88 W but why?
specific heat of aluminum 900 J/Kg * C
specific hear of aluminum 4186 J/Kg *C
A 200g aluminum cup contains 800g of water in thermal equilibrium at 80 degrees C. The combination of the cup?
Heat lost by cup to drop 1 Deg. C= (mass1*sph1)=0.2kg X 900 J/kg
=180J/min
Heat lost by water to drop 1 Deg. C=(mass2*sph2)=0.8 X 4186 J/kg
=3348 J/min
Total heat loss per minute = 180+3348=3528 J/min
Heat lost to decrease 1.5 degrees C= 3528 X 1.5=5292 J/min
1 Watt= 1J/sec
Total watts= 5292/60
=88.2 W
Reply:(mass1*sph1+mass2*sph2)*1.5ºC/min
comes out to 88.2W
wedding florist
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