# physics

The weight of an object is the same on two different planets. The mass of planet A is only forty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.

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1. mA/rA^2 = mB/RB^2 since the weights are equal.

rA^2/rB^2 = mA/MB = 0.45
rA/rB = sqrt(0.45) = 0.671

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2. 0.671

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