My Math Forum Is 600 million revs/minute = 18 billion meters/minute?

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 August 29th, 2013, 02:24 AM #1 Newbie   Joined: Aug 2013 Posts: 1 Thanks: 0 Is 600 million revs/minute = 18 billion meters/minute? Hi, I have a speed question: If a sphere sized 4 millionth of a meter spins at a rate of 600 million revolutions per minute, does the speed of its revolution linearly equate to 18 billion meters per minute (the speed of light)? I want to know if 600 million revolutions per minute in the context of the article below equals the speed of light. I tried to compute it manually and got values which are equal if the sphere was sized 3 millionth of a meter, but I want to be sure because I'm not good at math at all. http://www.bbc.co.uk/news/uk-scotland-e ... e-23861397
 August 29th, 2013, 03:17 AM #2 Senior Member   Joined: Mar 2012 From: Belgium Posts: 654 Thanks: 11 Re: Is 600 million revs/minute = 18 billion meters/minute? $1 \; rev=\frac {4}{1000000} \cdot \pi \; m$ $1.000.000 \; rev=4 \pi \; m$ $600.000.000 \; rev=2400 \pi \; m$ So 600 million revs/minute $\approx$ 7540 meters/minute
 August 30th, 2013, 03:59 AM #3 Math Team   Joined: Sep 2007 Posts: 2,409 Thanks: 6 Re: Is 600 million revs/minute = 18 billion meters/minute? You say a sphere "size 4 millionth of a meter". Is that the radius or the diameter of the sphere?
August 30th, 2013, 06:33 AM   #4
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Re: Is 600 million revs/minute = 18 billion meters/minute?

Quote:
 Originally Posted by HallsofIvy You say a sphere "size 4 millionth of a meter". Is that the radius or the diameter of the sphere?
I checked that in the article and there they say it is the diameter

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