Posted by help please on Sunday, December 11, 2011 at 7:37pm.
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  drwls, Sunday, December 11, 2011 at 8:57pm
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  Anonymous, Sunday, December 11, 2011 at 9:45pm
for the second equation use R, not R' correct?
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