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Mars rotates slowly about its axis, the period being 687 days. The mass of mars is 6.39 x 10^23 kg. Determine the radius for a synchronous satellite in orbit around Mars. (assume circular orbit)

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GMm*ms/r^2=mw^2 r
w=2pi rad/687days
=2PI/(687*24*3600) rad/sec

solve for r.
r^3=GMm/w^2

r = cubr of that

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