Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cocentric circles

  1. Nov 21, 2003 #1
    a man jumps out of a plane w/ a parachute at 1000m above a spherical planet (point A). He sees a satellite rise at the eatern horizon. Standing 2 m above surface of the planet (equator)(point B), the satellite re-appears 1.5 minutes after he saw it at 1000 m above sea level. From this point, the satellites position is exactly corresponding to a 90 degree angle from the zenith, ie, point B = middle of the planet. The difference in angle between radius of small planet+2 and radius+1000 is 1.35 degrees. Similary, 90 degree altering of position for satellite takes 100 minutes.
    What is the radius of the planet?
  2. jcsd
  3. Nov 22, 2003 #2
    This sounds like a homework problem to me... Perhaps it should be moved to the Homework help section?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook