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shadowice
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Homework Statement
A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.50 hours. What is density of the planet? Assume that the planet has a constant density.
R= radius
G= gravational constant = 6.6742x10^-11
M = mass of
m = mass of
T = period = 9000 seconds
M = mass of earth
m = mass of planet
w= angular velocity
P = density
Homework Equations
(GmM)/R^2 = Rw^2
GPv/R^3 = W^2
w = 2pi/T
volume = 4/3pi*R^2
P= M/V
The Attempt at a Solution
i have lots of formulas and not really sure how to go about using them all
i know to start with
(GmM)/R^2 = Rw^2 then sub for w divide by r
(GmM)/R^3 = (2pi/T)^2 from here I am not sure what to do to get mass then use my M/(4/3pi*R^2)