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You have arrived at a new planet and put your starship into a circular orbit at a height above the surface that is equal to two times the radius of the planet. Your speed is 4300 m/s and it takes 7 hours and 18 minutes to complete an orbit.

a. What is the radius of the planet?

b. What is the mass of the planet?

  • physics -

    a. Let R be the radius of the orbit and R' be the radius of the planet.

    V *7.3 min*60 sec/min = 2*pi*R
    Solve for R, then use R' = R/2.

    b. G*M/R^2 = V^2/R
    Solve for M

  • physics -

    for the second equation use R, not R' correct?

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