Jika massa bulan berukuran 2 kali lipat, bagaiamana gaya diantara bulan dan bumi akan berbeda?
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= G m m : m
r²
= GM
R²
ga = G Ma : G Mb
gb Ra² Rb²
= 2Mb × Rb²
Ra² Mb
= 2Rb²
Ra²
a = bulan
b = bumi