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a 500g balance weight is transported to the surface of planet z where an objects weight is measured to be 5.00N. The radius of the planet is 5.0x10^5m. What is the mass of planet z?

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well,
F = GMm/r^2
5.00 = GM(0.5)/(5.0*10^5)^2
Plug in G and solve for M

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