Ash asked in Science & MathematicsPhysics · 4 weeks ago

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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  • 4 weeks ago
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    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.

    • Ash4 weeks agoReport

      Thanks so much

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  • 4 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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  • Anonymous
    4 weeks ago

    Sure : g = Mp*G/rp^2 ...G beingh worth 6.67*10^-11

    • Ash4 weeks agoReport

      Not sure how to do this... r=4.1*10^6 and mass=3.1*10^24

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  • 4 weeks ago

    Yes, assuming the planet is a sphere.

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