Question

25 Point Emergency!!! Absurd answers will cause you're answer, and account, to be reported.

On a certain planet, a 4950 kg rock weighs 22,030 N. If this planet has a radius of 4200 km, what is the mass of the planet?

1.18∗10^24 kg

4.51∗10^24 kg

1.92∗10^25 kg

3.06∗10^25 kg

Answer 1

F = G M1 M2 / R^2 attraction between 2 masses

M1 = F R^2 / (G M2)

M1 = 2.20E4 * (4.2E6)^2 / (6.67E-11 * 4.95E3) kg

M1 = 2.2 * 4.2^2 / (6.67 * 4.95) E24

M1 = 1.18E24 kg