P2207_fall10_lecture29

P2207_fall10_lecture29 - water initially at 20 C to a boil...

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Lecture 29
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Today: Thermal expansion Heat energy Latent heat
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On a cold winter day with T=-10 C , the Eiffel Tower is 300 m tall. How tall is it on a hot summer day when T=40 C ? The Eiffel Tower is made from steel with a thermal expansion coefficient =11 10 -6 /K . A. 300.001 m B. 300.16 m C. 316 m D. 420 m
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A cylindrical rod is just slightly too large to fit through a circular hole . If you want the rod to fit through the hole, should you heat the plate or cool it ? A. Heat B. Cool
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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
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Unformatted text preview: 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 ) Material Thermal conductivity K W/(m·K) at 25C Air 0.025 Wood 0.04 – 0.4 Alcohol or oil 0.15 Soil 0.15 Rubber 0.16 Epoxy (unfilled) 0.19 Water (liquid) 0.6 Glass 1.1 Ice 2 Stainless steel 15 Lead 35.3 Copper 401 Silver 429 Diamond 900 – 2320...
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This note was uploaded on 12/18/2011 for the course PHYS 2207 at Cornell.

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P2207_fall10_lecture29 - water initially at 20 C to a boil...

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