lecture 29 - classe
TRANSCRIPT
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Lecture 29
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Today:
• Thermal expansion
• Heat energy
• Latent heat
• Thermal conduction
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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
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
Lv = latent heat of vaporization
Additional heat =
A. Q Lv
B. Q Lv / c
C. Q Lv / (c 80)
D. Q Lv / (c 100)
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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