Today we basically did a "practicum" where we took what we have learned about heat transfer and put it to the test by creating "thermoses" too keep water as hot as possible for as long as possible. I did not shoot any video today since the entire day was basically lab work. Using styrofoam, aluminum foil, plastic wrap and more, the task was to create a device that let as little heat out as possible. The students had to do whatever they could to avoid heat escaping by the three methods of heat transfer.
Homework for 1/18
1. Actually DO the assignment from last week where you were to look at 4 coffee mugs/thermoses and analyze them for plusses and minuses as far as the three methods of heat transfer goes. Basically use the same technique you used today when you analyzed my coffee mug.
1.b. Take a look at a cooler. A cooler's job is to keep heat from getting into it and warming up the contents within. Analyze a cooler according to the 3 methods of heat transfer.
2. Write up what you did today in class. What were your thought processes as you put together your thermos. What did you do the try to keep heat from escaping? Be sure to apply all three of the methods of heat transfer to your answer.
3. Calculate how much heat was lost in 10 minutes. Use 100g for the mass of the water and 12 C for change in temp. (if you can remember your actual delta T please feel free to use that instead).
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"Science Jim" Mueller
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