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March 25, 2017

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radius of the earth = 6.37 × 10^6
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 - ,

    They 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 - ,

    How would I know W if that wasn't given?

  • physics - ,

    So 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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