# physics

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Planet X has the same mass as earth, but its radius is only half as big. How does the gravity on this planet compare with the gravity on our planet earth?

• physics -

Duplicate question. Refer to my response elsewhere.

• physics -

g1 = G•M/R^2
g2 = G•M/r^2
r=R/2
g1/g2=r^2/R^2=1/4

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