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April 20, 2014

April 20, 2014

Posted by **Tim** on Thursday, December 15, 2011 at 4:35pm.

what is the speed of a 90.6 kg person at the equator?

I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one?

Thanks

- physics -
**drwls**, Thursday, December 15, 2011 at 4:42pmThey are not asking for the force. They want the speed due to the rotation of the earth. That equals R*w.

R is the earth radius and w is its rotation rate in radians per second.

- physics -
**Tim**, Thursday, December 15, 2011 at 4:48pmHow would I know W if that wasn't given?

- physics -
**Tim**, Thursday, December 15, 2011 at 5:12pmSo I figured this out myself a=v^2/r

which is also equal to (4pi^2*r^2)/T^2

and T is 86400 secs which is how long it takes for a day to pass

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