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Rotation relative to an inertial frame

  1. Feb 21, 2014 #1
    Earth has a huge angular velocity regarding its rotation. Now let's imagine that the earth has the velocity of 400 km/s relative to some inertial frame. What will be the velocity of Earth when we take the rotation into account combined with inertial motion? How do the 2 combine?

    Thanks in advance.
  2. jcsd
  3. Feb 21, 2014 #2


    Staff: Mentor

    I think that you mean "huge tangential velocity". The angular velocity is not huge, it is 0.00007 1/s. The tangential velocity is about 0.5 km/s at the equator, which may or may not be "huge" depending on the context.

    Velocities add vectorially. Don't forget that the tangential velocity is pointing in a different direction at each point on the earth, so you can do this addition for each point on the earth and you will get a different value.
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