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Calculate the speed of aircraft

  1. Jan 21, 2007 #1
    An aircraft flying at an altitude of 10 km finds that the sun is stationary in the sky. Calculate the speed of aircraft.
  2. jcsd
  3. Jan 21, 2007 #2
    Seems like he would be flying as fast as the earth is spinning. Of course he would have to be going a little faster because he is higher up than the surface of the earth.

    edit - Oh no, my post has committed some sort of 'Infraction' ! wtf? I guess my thoughts are no good. lol
    Last edited: Jan 21, 2007
  4. Jan 22, 2007 #3
    Please clarify!! Whats the altitude given for??
  5. Jan 22, 2007 #4


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    The infraction is that there was no attempt from the OP at a solution!
  6. Jan 22, 2007 #5


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    Use the altidude to find the radius of the circle the plane is flying around.

    How long must it take to complete the full circle? If you can answer those questions you can find the speed of the plane.
  7. Jan 22, 2007 #6


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    There is a critical piece of info missing: latitude. A plane at 89 degrees latitude will be moving significantly slower than a plane at 0 degrees latitude.
  8. Jan 22, 2007 #7
    This is just a logic problem more than numbers really. Given the sun is rising here at say 5 AM PST, it's rising at 5 AM EST [9 AM PST].

    That's 4 hours, simply by that we can just get a general idea of how fast it would need to go from here to there. Even then, we can just look at the next time zone and confirm if it's true.

    I feel the 10 km in the air doesn't matter; but I could be wrong =).
  9. Jan 23, 2007 #8
    Hey! Please psot only if you know exactly about the question's demand. Please dont misguide!!!!!!
  10. Jan 23, 2007 #9
    First please clarify this point. If I just rise up to a certain height and stop. Will I move further due to rotation?
  11. Jan 23, 2007 #10


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    Well, you will need the latitude, otherwise you can't figure out the speed.
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