The weight of an object is the same on two different planets. The mass of planet...
The weight of an object is the same on two different planets. The mass of planet A is only 60 percent that of planet B. Find the ratio rA/rB of the radii of the planets.
Homework Answers
we can equate the gravitational force from both planets
GMam / ra2 = GMbm / rb2
we get
Ma / ra2 = Mb / rb2
ra / rb = sqrt (ma / mb)
ra / rb = sqrt (0.6mb / mb)
ra / rb = sqrt (0.6)
ra / rb = 0.7745
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