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Satellite question. find mass of planet and weight on planet?

  1. Nov 17, 2006 #1
    A satellite, mass of satellite=5850 kg, is in circular orbit of 4.1x10^5m above the surface of a planet, which has a radius of 4.15x10^6m. The period for the orbit is 2 hours.
    A) calculate the tangential velocity of the satellite.
    B) find the mass of the planet.
    C) how much would the satellite weigh on the surface of the planet?

    I have only been able to fint the tang-velocity.
    v = √(GM / R )
    = √(6.67 x 10-8 x 5850 / 4.1 x 105 ) m/s

    Can anyone solve part B and C?
     
  2. jcsd
  3. Nov 17, 2006 #2
    mrw^2=GMm/r^2 manipulate the v=rw and w=2pi/period
     
  4. Nov 18, 2006 #3
    For both cases equate centripetal force with gravitational force and you you be able to get the answer.
     
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