G10 ch7 section 2

Engineers are planning to place a space station into orbit at an altitude of 450 km above Earth’s surface. What would be the period of the station ? (Earth's mass is $$5.97\times10^{24}\ kg$$ , and radius $$6.38\ \times10^6$$ m) $$𝐺=6.67\times10^{-11}𝑁𝑚^2/𝑘𝑔^2$$

Miranda, one of Uranus's moon has orbits at radius of 1.29 × 10⁸ m and mass of 8.68 ×10²⁵ kg find the orbital speed of Miranda

Miranda, one of Uranus's moon has orbits at radius of 1.29 × 10⁸ m and mass of 8.68 ×10²⁵ kg find the period of orbiting