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-   -   physics problem: (speed of a point on earth) (http://www.physicsforums.com/showthread.php?t=43290)

lmf22 Sep15-04 08:03 PM

physics problem: (speed of a point on earth)
 
What is the speed of a point on the equator of the Earth due to Earth's daily rotation?

What is the speed of a point at latitude of 45 degrees N?

Can I use the radial acceleration equation:
a = (V^2) / r

or

v = (2*pi*r) / period
where period = 24 hours = 86400s

Doc Al Sep15-04 08:13 PM

Well... since the problem asks for speed, don't you think you should use the formula for speed? :smile: (Be sure to use the correct radius.)

lmf22 Sep15-04 08:18 PM

How do I figure out the radius at 45 degress latitude?

Doc Al Sep15-04 08:41 PM

Draw yourself a picture. You'll find a right triangle whose hypotenuse is the radius of the earth. One of the sides is the radius you want. Use some trig.


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