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Post by Mr. Askey on Sept 8, 2014 18:25:13 GMT -6
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ryanhunter
Physics Student
Posts: 4 
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Post by ryanhunter on Sept 8, 2014 18:57:38 GMT -6
On number 23, what conversion would I start with? I think that 1000 mph is a given, but that's what I started with. How would I start so that I can do it the "physics way" and not the "chemistry way"?
Edit: meant to type question 23, not 26
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philliplong
AP Physics
Posts: 396
Registered: Mar 10, 2013 16:29:37 GMT -6
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Post by philliplong on Sept 8, 2014 19:15:54 GMT -6
Askey, do you have a link to the physics take home test?
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kylieb77
Physics Student
Posts: 1 
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Post by kylieb77 on Sept 8, 2014 19:18:52 GMT -6
Start with the unit you want to end up with, so that way you can cross out the other units you are using.
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Post by Mr. Askey on Sept 8, 2014 19:35:14 GMT -6
Ryan! I will give you a bonus stamp on your notebook for asking the first forum question of the year! Kylie also gets a bonus stamp for giving him an answer.
Now give me a minute and I will answer your question.
Phillip -- there is a THT on my website under papers.
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Post by Mr. Askey on Sept 8, 2014 19:37:20 GMT -6
since you need to end up in centimeters, your first step would be to multiply the conversion (clever form of one): 100 cm/m
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Post by Mr. Askey on Sept 8, 2014 19:39:31 GMT -6
then, of course, your next step is to multiply by (0.305 m / ft) . . . another clever form of one! Your total unit analysis will end up with 5 conversions and 2 givens. Your answer will be somewhere between 3000 and 3500 cm.
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tamahminnis
Physics Student
Posts: 4
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Post by tamahminnis on Sept 10, 2014 22:25:54 GMT -6
Mr. Askey, why on problem 25 do you include the mathematical two?
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Post by Mr. Askey on Sept 11, 2014 12:52:02 GMT -6
Because there were 2 cubic miles of air. If there were 6 cubic miles of air I would have multiplied by a naked 6 (meaning there are no units).
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