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Problem on order of magnitude estimating

  1. Sep 14, 2008 #1
    1. The problem statement, all variables and given/known data
    The sun sets, fully disappearing over the horizon as you lie on the beach, your eyes 20cm above the sand. you immediately jump up, your eyes now 150cm above the sand, and you can again see the top of the sun. if you count the number of seconds until the sun fully disappears again, you can estimate the radius of the earth. but for this problem use the knwon radius of the earth and calculate the time t.
    radius of the earth: 6,380km
    average orbital speed for earth: 107,218 km/h (if needed for solving the problem)

    Sorry, this is my first time of taking physics, so I have no idea how to solve the problem. Therefore, full solution please. Thank you very much
  2. jcsd
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