That takes a lot of practice and graphing in order to predict your final temperature. There's no concrete formula.SSL wrote:How do you predict the temperature of the water in my device?
Keep the Heat B/Thermodynamics C
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JSGandora
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Re: Keep the Heat B/Thermodynamics C
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JSGandora
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Re: Keep the Heat B/Thermodynamics C
Was 74 degrees the temperature of the water when it was inside your box? Or was it of the water bath?foreverphysics wrote:We won KtH today. The temperature dropped to 53.5 degrees (exactly our predicted) after 25 minutes with a starting temp of 74 degrees. Room temperature was standard 20.0 degrees. 100 mL of water.
The test was stupid easy. 10 questions. All multiple choice. The hardest question there?
"Why is heat spontaneously flowing from a cold material to a hot material impossible?" Then they gave us four choices: a) first law of thermodynamics, b) law of conservation of energy, c) second law of thermodynamics, and d) fourth law of thermodynamics.
/facepalm
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foreverphysics
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Re: Keep the Heat B/Thermodynamics C
It was of the water bath about two minutes before we put the water in our device. Actually, according to our graphs, the final temperature should have been 53.8 degrees, but I lowered it to 53.5 because of that two minutes.I was accurate.
Physics is difficult for 99% of the world's population because they don't understand it. The other 1% know too much.
"Physics is a psychiatrist?"
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beastyeti
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Re: Keep the Heat B/Thermodynamics C
I was wondering if we were allowed to write on our insulating device with ink.
I wrote our school name on it and a couple of other things...
I wrote our school name on it and a couple of other things...
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JSGandora
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Re: Keep the Heat B/Thermodynamics C
Our device is written on with ink and no penalties were issued in any tournament I've been in, so you're fine I would think.
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beastyeti
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Re: Keep the Heat B/Thermodynamics C
Thanks! *sigh of relief*JSGandora wrote:Our device is written on with ink and no penalties were issued in any tournament I've been in, so you're fine I would think.
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chalker7
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Re: Keep the Heat B/Thermodynamics C
This is not an official clarification, but I feel that would generally violate the spirit of the problem.LMayeski84 wrote:Is the box allowed to be preheated in the 5 minutes of set up?
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Hawaii State Director
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j98rp
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Re: Keep the Heat B/Thermodynamics C
Are we allowed to use our notes during the test part of this compettion???
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j98rp
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Re: Keep the Heat B/Thermodynamics C
Are we allowed to use our notes during this part of the competiton??? part 2 is the part im talking about!