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Homework Help: Find angular speed of a point on the earth

  1. Dec 11, 2005 #1
    what is the angular speed [tex] \Omega[/tex] about the polar axis of a point on earths surface at a latitude of [tex]40^o[/tex]

    I know that the radius of the earth is [tex] 6.37 x 10^6m[/tex]

    I also know that the earth rotates about this axis ([tex]40^o[/tex])

    What do I do?
  2. jcsd
  3. Dec 12, 2005 #2


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    Homework Helper

    This is geometry. Draw a circle, and mark an angle of 40 degrees (this is equivalent to lattitude of 40). What is the x component? This is the component that 'effectively' participates in the circular motion.

    Edit: If it's the angular velocity you are looking for, you'll find that it will be the same regardless of lattitude.
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