lecture29_notes

lecture29_notes - c=4190 J/(kg K) Lv=2256 kJ/kg A. 10...

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Specific Heat c:
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Suppose that it takes an amount of heat Q to bring a pot of water initially at 20 ° C to a boil. How much additional heat must you add to boil all water away? c = specific heat of water L v = latent heat of vaporization Additional heat = A. Q × L v B. Q × L v / c C. Q × L v / (c × 80 ° ) D. Q × L v / (c × 100 ° )
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Suppose that it takes 10 minutes to bring a pot of water initially at 20 ° C to a boil. How much longer does it take to boil all the water away, assuming a constant rate of heat input?
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Unformatted text preview: c=4190 J/(kg K) Lv=2256 kJ/kg A. 10 minutes B. 10 × (2256 × 10 3 ) / 4190 = 5400 minutes C. 10 × (2256 × 10 3 ) / (4190 × 80) = 67 minutes D. 10 × (2256 × 10 3 ) / (4190 × 100) = 54 minutes 1.1 Glass 900 – 2320 Diamond 429 Silver 401 Copper 35.3 Lead 15 Stainless steel 2 Ice 0.6 Water (liquid) 0.19 Epoxy (unfilled) 0.16 Rubber 0.15 Soil 0.15 Alcohol or oil 0.04 – 0.4 Wood 0.025 Air Thermal conductivity K W/(m·K) at 25C Material...
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This note was uploaded on 02/20/2008 for the course PHYS 2207 taught by Professor Liepe, m during the Fall '07 term at Cornell.

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lecture29_notes - c=4190 J/(kg K) Lv=2256 kJ/kg A. 10...

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