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Chapter(5v2 r2 =G M r3 τ=orbital period= 2πr v ∴τ=2π r3 GM τ Earth =2π (1.5×1011) 3 (6.67×10−11)(1.99×1030) =3.2×107 s τ Mercury =2π (0.4×1.5×1011) 3 (6.67×10−11)(1.99×1030)
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