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Homework Help: G-field - help very confused

  1. Feb 18, 2007 #1
    1. The problem statement, all variables and given/known data
    please look at the following statements:
    1: due to air resistance, total energy of a satelliit will decrease gradually, dissipated into internal energy.
    As T.E. = -GMm/2r, r will decrease, hence K.E. increases (K.E.=GMm/2r), implies speed increses.
    (T.E.=PE+KE)

    2: 98 01A 1 (c)(ii) E=T.E.
    http://m1.freeshare.us/128fs1722277.png
    http://m1.freeshare.us/128fs1722344.png

    2. Relevant equations

    T.E.=PE+KE

    3. The attempt at a solution
    in 2, if speed decreases, hence KE (=1/2 mv^2) decrease, as K.E.=GMm/2r, then r should be increased instead of decrease, so any contradiction?
     
  2. jcsd
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