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The mass of a robot is 6680 kg. This robot weighs 3070 N more on planet A than it does on planet B. Both planets have the same radius of 4.00 x 10^8. What is the difference Ma - Mb in the masses of these plantes?

I used this equation F = G * (m1*m2)/(r^2)

F = 3070 N

m1 = robot

mb = extra mass of planet A

r = 4.00 x 10^8

3070 = 9.673 x 10^-11 * 6680m2/ (4.00 x 10^8)^2

3070 = (2.786 x 10^-24)m

1.1019 x 10^27 = m

Is this correct or do I have it totally wrong?

-Serena

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# Homework Help: Difference in Planet Mass

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