Week 4: Thermodynamics Chapter 21

Facts you may need for the Quiz:
The 2nd Law of thermodynamics & its implications

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Concept-tests:
4.1 Car on Ramp

4.2 Evolution and Entropy

4.3 Temp raise and Entropy

4.4 Electricity and Efficiency

4.5 Heat Pump

4.6 Efficiency of Heat Engine--this is different than what was presented in class on Wednesday.(see Latest News on the home page)


Answers to Concept Tests

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Demos:
THROW THE CHALK AGAINST THE BLACK BOARD--demonstrated the arrow of time. The chalk can move back and forth in the spatial dimensions, but not in time.

BALLOON & HAND IN LIQUID NITROGEN--demonstrated the ideal gas law on the balloon, and the Leidenfrost effect on the hand (pg 533 in your book).

Hero's Engine a steam engine, that loses its working fluid.

Thermoelectric Convertor needed a temperature difference to Work.

Sterling Engine A hot side and a cold side, like your book talks about (pg 515).

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Links:

Free Electricity-- Bogus claims of perpetual motion machines, and creation of energy out of nothing. Believe it or not, everything on the web is not true. With your scientific knowledge you can now pick out fraud.
This "free electricity" web site is ripped apart on the How things work web site.
Who can you trust??? Try logic and reason.