# 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?

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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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