Q6. A planet has a moon with an orbital radius of \( 5 \times 10^8 \, \text{m} \) and a period of 10 days. What is the planet’s mass? (\( G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2, 1 \, \text{day} = 86400 \, \text{s} \))
- A. 8.5 × 10²⁴ kg
- B. 9.0 × 10²⁴ kg
- C. 9.9 × 10²⁴ kg
- D. 10.5 × 10²⁴ kg