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Unformatted text preview: Since we know the brick starts out at 150 K , we know where on the heat curve we begin (green arrow). To melt half of our brick, we need to travel half the way to completely melted, which will be to the red arrow. The question asks us to find the energy needed to go from the green arrow to the red arrow. This is 4250kJ750kJ= 3500kJ . Water Alcohol Energy System Diagram Checklist: Values of all known indicators Algebraic statement of energy conservation Labeled different substances Indicated if system is open or closed. 50 100 150 200 250 300 350 400 450 500 550 600 650 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 Temperature (K) Energy Added (kJ) E b m(l) i =0kg m(l) f =0.25kg E th T i = 23 C T f =? (<23 C ) E th + E b =0, closed system...
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This note was uploaded on 01/05/2011 for the course PHY 7A taught by Professor Pardini during the Winter '08 term at UC Davis.
 Winter '08
 PARDINI

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