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September 23, 2014

September 23, 2014

Posted by **Chris** on Wednesday, November 7, 2012 at 7:33pm.

- Math -
**bobpursley**, Wednesday, November 7, 2012 at 7:52pmThis is a neat trick, as Earth is not spherical, the difference in radius at the poles compared to the Equator is 31miles.

Ignoring that bit of fact, assuming the Earth is spherical, and there is no atmospheric drag,then

period=1day=24hrs*3600sec/hr

speed=distancearund/tperiod=2PI(3959+6)/periodabove.

- Math -
**bobpursley**, Wednesday, November 7, 2012 at 7:53pmoops, I missed the 220 degrees, so period=2PI(3965)*360/22O

- Math -
**Chris**, Wednesday, November 7, 2012 at 8:04pmHi Bob - I have 4 possible answers and cannot arrive at any of them by the above. My choices are (a)634mph (b)1038mph (c)761mph (d)113mph

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