Physics

A carefully designed experiment can measure the gravitational force between masses of 6 kg. Given that the density of iron is 7860 kg/m3, what is the gravitational force between two 6.00-kg iron spheres that are touching?

The answer is 1.87e-07 N. How do I get this answer?

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  1. V=4πR³/3
    Density ρ=m/V = 3m/4πR³ = >
    R=cuberoot(3m/4π ρ)

    the gravitational constant
    G =6.67•10^-11 N•m²/kg²,

    F =G•m1•m2/R²

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  2. Sorry! Force is
    F =G•m1•m2/(2R)²

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  3. Thank you!

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  4. How do you figure out the R-value?

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  5. Never mind.

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