Roark Posted December 16, 2002 Share Posted December 16, 2002 Please some help: What is the formula to convert the area of a globe into cubic feet? If a solid sphere has 12" diameter, for example, or 11", how would I convert that to cubic feet? Also, for one cubic foot to be put into a sphere, what would the diameter be? I am wroking on Goerner's metal ball and could use some help. BarBender, Nathan? Thank you. Quote Link to comment Share on other sites More sharing options...
amaury Posted December 16, 2002 Share Posted December 16, 2002 Volume of the sphere= (4/3)*Pi*R*R*R R=radius of the sphere Quote Link to comment Share on other sites More sharing options...
Roark Posted December 16, 2002 Author Share Posted December 16, 2002 amaury, Thanks! So if the diameter is 10", then 4/3 times 3.1428 times 5 times 5 times 5? By the way...have a fun trip Quote Link to comment Share on other sites More sharing options...
Tom Black Posted December 16, 2002 Share Posted December 16, 2002 Pi is 3.14159 not 3.1428, although I don't think it would make too much difference. Answering your question about the one cubic foot into a sphere, the sphere radius would have to be 7.444 inches. Quote Link to comment Share on other sites More sharing options...
amaury Posted December 16, 2002 Share Posted December 16, 2002 Joe, So if the diameter is 10", then4/3 times 3.1428 times 5 times 5 times 5? absolutely (except Pi=3.14159(265...) as Tom mentioned) ! The trip is for this week... Quote Link to comment Share on other sites More sharing options...
Roark Posted December 16, 2002 Author Share Posted December 16, 2002 Tom, Thanks for the correction on Pi. So, a dumbell with two speheres of 14.888" diameter each, would be a dumbell having two cubic feet in the spheres, plus the weight of the handle. THAT would make the Millennium Bell look like a keychain attachment Quote Link to comment Share on other sites More sharing options...
BarBender Posted December 16, 2002 Share Posted December 16, 2002 This page has formulas for the surface area and volume of a sphere in Euclidean N-space. http://db.uwaterloo.ca/~alopez-o/math-faq/...ext/node41.html Most calculators have a button for Pi. Precision up to ten decimal places should suffice for most practical purposes. Quote Link to comment Share on other sites More sharing options...
Roark Posted December 16, 2002 Author Share Posted December 16, 2002 BarBender, Thanks. I think :huh I'll try some calculations later today, and ask if you would grade my results later? Math is more my soot than my suit. Quote Link to comment Share on other sites More sharing options...
BarBender Posted December 16, 2002 Share Posted December 16, 2002 Considering the current climate concerning posting rules for "out of this world claims" I figured you could benefit from "out of this world" formulas. Quote Link to comment Share on other sites More sharing options...
Roark Posted December 16, 2002 Author Share Posted December 16, 2002 I think I understand all but half of it Quote Link to comment Share on other sites More sharing options...
Nathan Say Posted December 16, 2002 Share Posted December 16, 2002 Actually pi is what's here. Quote Link to comment Share on other sites More sharing options...
Adam Black Posted December 16, 2002 Share Posted December 16, 2002 Actually Nathan, that link is not up to date. Some folks at the University of Japan recently calculated PI out to over 1 trillion places. And who says nobody has free time? Full Story Quote Link to comment Share on other sites More sharing options...
Nathan Say Posted December 16, 2002 Share Posted December 16, 2002 Yeah I saw the date on mine & it said 1996. I know there was a big beowulf cluster built recently to calculate pi because my U loaned out their supercomputer for a day to whoever was organizing it. Quote Link to comment Share on other sites More sharing options...
Roark Posted December 16, 2002 Author Share Posted December 16, 2002 Well that's it then. If I'm to get only incomplete answers... Quote Link to comment Share on other sites More sharing options...
Guest Mark Posted December 17, 2002 Share Posted December 17, 2002 Nathan and Adam, What do you guys do to relax :sleeping ? Figure out what was wrong with Einstein's theories ? I never realized there was such a thing as experts on pi (other than the kind you eat ). Mark Quote Link to comment Share on other sites More sharing options...
Nathan Say Posted December 17, 2002 Share Posted December 17, 2002 Click on my name & you can see what I do for fun (or to relax), hehe. Quote Link to comment Share on other sites More sharing options...
BarBender Posted December 17, 2002 Share Posted December 17, 2002 Mark did not mention me so I must appear relaxed in my mathematical digressions. More Pi trivia: Pi is a transcendental number but it is not known if it is a normal number. http://mathworld.wolfram.com/NormalNumber.html Quote Link to comment Share on other sites More sharing options...
Adam Black Posted December 17, 2002 Share Posted December 17, 2002 (edited) Mark, as a matter of fact I do read quite a bit about Einstein's theories, physics is an area of interest for me. But that's neither here nor there. I actually had read the pi article a day or so prior to this thread, so it was still fresh in my mind. I am an engineer and it's my nature to be persnickety. Edited December 17, 2002 by Adam Black Quote Link to comment Share on other sites More sharing options...
Adam Black Posted December 17, 2002 Share Posted December 17, 2002 And I am an expert on pie! Quote Link to comment Share on other sites More sharing options...
Guest Mark Posted December 17, 2002 Share Posted December 17, 2002 Barbender, My apologies . I certainly did not mean to exclude you from our elite group of math whizzes. And this discussion seems a bit transcendental and not so normal Adam, Let me make sure I got this right. You are an engineer who is an expert on Einstein's theories, reads about pi, and is also an expert on pie . What free time? Nathan, Well at least you've struck a balance between the mind and body Sounds like your time is about split between posting on the grip board and memorizing pi. Mark Quote Link to comment Share on other sites More sharing options...
Guest Mark Posted December 17, 2002 Share Posted December 17, 2002 Barbender, My apologies . I certainly did not mean to exclude you from our elite group of math whizzes. And this discussion seems a bit transcendental and not so normal Adam, Let me make sure I got this right. You are an engineer who is an expert on Einstein's theories, reads about pi, and is also an expert on pie . What free time? Nathan, Well at least you've struck a balance between the mind and body Sounds like your time is about split between posting on the grip board and memorizing pi. Mark Quote Link to comment Share on other sites More sharing options...
Adam Black Posted December 18, 2002 Share Posted December 18, 2002 Adam, Let me make sure I got this right. You are an engineer who is an expert on Einstein's theories, reads about pi, and is also an expert on pie . What free time? Well, that's not quite right. I am no expert on Einstein's theroies. I just enjoy physics and have a good working knowledge of Einstein's work. But the rest sounds right. Quote Link to comment Share on other sites More sharing options...
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