rachaelt

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Monday, April 17, 2006

Solar cooker

Question and Hypothesis

Does the size solar cooker affect the temperature increase?
Yes, I think the bigger the cooker, the more the temperature will increase.

Scientific Procedure

1. I did research on solar energy and I got a plan.

2. I built my solar cooker.

3. I came up with a question and a hypothesis.

4. I took it outside and put it in the shade for five minutes for the baseline temperature.

5. I put my solar cooker in the sun for ten minutes, checking and recording the temperature every two minutes.

6. I found someone in my class with a big panel cooker, and recorded their temperature to compare their data to mine, to answer my question.

Results

Conclusion

My hypothesis was correct. The bigger the cooker, the more the temperature wil increase. The more material it allows you to put on the cooker. The material absorbs the sun, and reflects onto your container heating it up faster. At first when the big panel cooker was in the sun, it's baseline was 58 degrees, and the small panel cooker was 71 degrees. The final temperature, the big panel cooker was 101 degrees. The final temperature for the small panel cooker was 103 degrees. Therfore, the smaller panel cooker increased 32 degrees, where the big panel cooker increased 42 degrees.

Discussion

Getting energy from solar cookers is a lot better than getting it by burning coal. A reason is because the when you burn coal it gives off carbon dioxide, when we need oxegyn instead. Another reason is that it gives off a lot of gases that pollute or air. Mr. Tubbs asked us to compare our data with somebody else in the classroom, or make any adjustments. I compared my panel cooker with a cooker that was bigger than mine. I think he wanted us to do that becasue you have to know all the important facts about your cooker, and to do that you must compare it with something different to see which one worked better. One observation I made was that from 6 minutes on, my cooker stayed the same degrees of 103. I think that happened because I think that it wasn't my cooker that did anything, but I noticed that the wind started to pick up, and I think a cloud could have covered the sun.

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Posted by: rachaelt in: My entries

Thursday, January 5, 2006

Plant cells make their energy by a process called photosynthesis. Photosythesis takes place inside a chloroplast. The chloroplast captures sunlight, which is mixed with carbon dioxide and water. The sunlight, carbon dioxide, and water all go into the plant. Then the oxygen and food come out of the chloroplast. Thats why if there was no such thing as photosynthesis we would not be alive today. (The plant gives us our oxygen.)

to find out more about photosythesis you can go to http://www.ftexploring.com/photosyn/photosynth.html

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Posted by: rachaelt in: My entries

Thursday, September 15, 2005

What is my country?

1. It is located South of the Equator. 2. It is located West of the Prime Meridian. 3. It has a coast on the Pacific Ocean. 4. It is East of Australia. 5. It is Southwest of Brazil. 6. It's absolute location of it's capital 34 degrees South, and 71 degrees West.