Tuesday we had pop quizzes for most classes over the reading from Monday night. Most students did poorly; either showing not getting much out of the reading, not taking time to read thoroughly, or not reading at all.
We also had notes on Specific Heat, the resistance to temperature change of a substance. I likened specific heat to "Thermal Inertia".
I demonstrated specific heat of water vs. a metal weight; we added 500g of (hot) water to one 400mL room temperature jar of water, and we added a (hot) 500g metal weight to another 400mL of room temperature jar of water. We monitored the temperature of each 400mL of water, and found that the 500g of hot metal hardly had an effect on the water's temperature, but the 500g of hot water DID change the room temperature water substantially.
Therefore water has a higher resistance to temperature change, or a higher Specific Heat.
Water actually has one of the highest specific heats of common materials. Only a few are higher.
Homework tonight:
Read p. 266-270
Study for Friday's Exam!!!!! There will be no math from the thermal energy unit assessed on this exam, however math from work, power, percent efficiency, etc. WILL be assessed.
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