H2P-89

Circular orbits

H2 Physics · JC 1 · Medium · Circular orbits

A small moon of mass

2.0 \times 10^{20}\,\text{kg}

orbits a planet of mass

6.0 \times 10^{24}\,\text{kg}

in a circular orbit of radius

3.0 \times 10^8\,\text{m}

. What is the orbital speed of the moon?

1.2 × 10³ m s⁻¹
3.6 × 10³ m s⁻¹
6.7 × 10² m s⁻¹
9.8 × 10³ m s⁻¹

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