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This is the exact problem from the paper and I got an answer of 4.2 * 10^7 and I was wondering if this was the right answer.

What is the height above the earth's surface at which all synchronous satellites (regardless of mass) must be placed in orbit? The period of synchronous satellites is one day. The radius of the earth 6.36(10)6m


    That is high. Did you work if from the Earth's surface, for from the center of Earth?


    I worked it from the center of the Earth so i have to go back and subtract the radius of the Earth from that answer.


    where is m v^2/r = G M m/r^2
    as you said, m cancels
    v^2 = G M/r
    T = 24 h *3600 s/h = 86,400 s
    2 pi r = v T = 86,400 v
    r = 13,751 v
    v^3 = G M/13,751 = 6.67*10^-11 * 6*10^24/1.38*10^4
    v^3 = 29*10^9
    v = 3.07 * 10^3
    then r = 4.24 * 10^7
    eight = (10^7 )(4.24 - .636) = 3.6 *10&
    remember to subtract the radius of earth to get the altitude.

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