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T² = 4phi²r²/GM
G = 4phi²r²/T²M
G = m²/.s²kg
= [L]²/[T]²[M]
= L^3.T^-2.M^-1
Lagian rumus persamaan Hk. Gravitasi Newton & Hk. Kepler III itu T² = 4phi²r³/GM
Rumusnya itu dapet dari Fs (gaya sentrifugal dr bumi) = Fg (gaya gravitasi Newton)
Fs = Fg
m.v²/r = GMm/r² ⇒ v = omega.r
m(omega.r)²/r = GMm/r²
m.omega²r = GMm/r² ⇒ omega = 2phi/T
m(2phi/T)²r = GMm/r²
4phi²r/T² = GM/r²
4phi²r³ = GM.T²
T² = 4phi²r³/GM
Salah soal menurutku itu :3