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Entries "October 2006":
Wednesday, October 25, 2006

scribe post#2

Learning Target

Use strategies to develop formulas for finding the circumference of circles.

Examples

            34.2÷7.5

34.2÷7.5= 4.56

Lesson

       If you multiply the radius by the diameter of a circle the answer is the circumference.  What we did on Friday was this, we took           a string and we put it around a circular object.  Then we measuredthe amount of string we used.  In other words we measured           the circomference of the circular object.  then we measured the diameter of the object.  Finally we divided the circomference by          the diameter and we got the radius.

Link                                                                                                                                                                              enter this link into your address line to learn more about this scribe post:          

       http://www.mathgoodies.com/lessons/vol2/circumference.html

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Posted by: eblingm    in: My entries
Solar Water Heater Blog Project

QUESTION AND HYPOTHESIS


     My question was, does covered or uncovered water with a black or white surrounding affect temperature of the water?
     My hypothesis was, if your solar water heater is covered and is black, then the water will heat up faster.

SCIENTIFIC PROCEDURES   

     1. Put water in your solar energy heater.
     2. Cut a hole in the lid (if you have a lid).
     3. Stick the thermometer in the hole you cut in the lid of your solar cooker. 
     4. Record the temperature.
     5. Go outside, put solar cooker in the sun, and wait five minutes, then record temperature.
     6. Wait five more minutes and record temperature again. Repeat once more. 
     7.  Come inside and discuss your results. 
     8. See which solar cooker of a)black uncovered, b) black covered, c) white uncovered, or d) white covered heated the water to           the highest temperature.                                                                                                                                              
RESULTS
     Black covered worked the best.  It worked the best because it soaked in the most solar energy.  Also black covered had a lid which helped keep in more thermal energy.  White uncovered worked the least best beacause it didn't soak up as much thermal energy and it let out thermal energy through the top because it didn't have a lid.

CONCLUSION
      My hypothosis was that the black covered solar water heater was the best at heating the water.  I was right because it turned out that the black covered was the best at heating the water in the end in my experiment.

CHANGES/NEW QUESTIONS
      I wouldn't take so long to make the parts for my experiment and I would have my new question be does a plastic cup with cardbourd on the top of it get hotter than a cup without a peice of cardbourd on it? 
 

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Posted by: eblingm    in: My entries