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Flying weight change

  1. Nov 24, 2004 #1
    A man in a plane flying due east above the equator at 600mph weighs 200 pounds. How much heavier will he weigh, if the plane turns around and flies due west?
  2. jcsd
  3. Nov 25, 2004 #2
    wild guess
    ::approx 203 pounds::

    -- AI
  4. Nov 25, 2004 #3
    slightly different...

    Considering g=9.81m/s² (sea level), H_plane=10km, and Earth_radius=6377km
    ::: 201.6 pounds :::
  5. Nov 26, 2004 #4
    I get the same answer as Rogerio. The question asked how much heavier the man weighs, and the answer I got is
    :: 1.595 pounds ::

    I used Earth radius = 6378.137 km, plane height = 38,920.6 ft (this gives a flight radius of 6,390,000 metres)

    I used a sidereal day of 86,164.1 seconds, and this results in a centripetal acceleration of 0.084356 m/s/s when flying east, and 0.006119 m/s/s when flying west.
  6. Nov 26, 2004 #5


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    :eek: I never considered I'd weigh more if I traveled west! There goes my plan of moving west continuously to synchronize my sleep schedule with normal daylight hours. I guess I'll just have to travel really far east :biggrin:

    (No, this is not at all a serious response; I may be a biologist, but they did make me take some basic physics classes).
  7. Nov 26, 2004 #6
    I've always wondered something. I know Jupiter is quite a bit bigger than earth, but has a much shorter day. How much would you weigh on Jupiter taking into account this?
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