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The planet Krypton has a moon that circles the planet in a circle that has a period of 40 days (watch units) and is 6 x 10^8 m from the planet's center. The planet's radius is 6.4 x 10^6 m. What would you weigh on Krypton if your mass is 70 KG? Show a free body diagram.

Im guessing use Net force = ma

The net force is the Gravitational force, Gm1m2 / r^2 is = m2 4 (pie)^2 r/ T^2

for the 4 (pie)^2 r/ T^2 r is the distance form the planet's center, to the moon, for T, find how many second 40 days is.

and the other r is the planet's radius

m2 cancels

solve for m1, and yo uhave the mass of the planet.

I guess plug in numbers after that, into the equaltion Fg = Gm1 m2 / r^2

m2 would be the 70 kg

Can someone help me out and tell me if what i am doing looks right?