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# Can you find gravitational constant of a planet knowing only the mass and radius?

Can you find gravitational constant of a planet knowing only the mass and radius?

Update:

radius = 4.1*10^6 and mass = 3.1*10^24

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- az_lenderLv 74 weeks agoFavorite Answer
g = [(6.67 x 10^(-11))(3.1 x 10^24)/(4.1 x 10^6)^2 ] m/s^2

= use calculator.

I am just ASSUMING that your mass was in kg and your radius in meters.

- Andrew SmithLv 74 weeks ago
I keep pointing out the blindingly obvious. HOW do you find the mass of a planet? You cannot put it on a scale. What you do is observe satellites about the planet and determine the gravitational acceleration. THEN you work using radius and gravitational acceleration to calculate mass.

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Thanks so much