Problem: The International Space Station is in a 230-mile-high orbit.Part A What is the station's orbital speed? The radius of Earth is 6.37 × 106 m, its mass is 5.98 × 1024 kg.Part B What is the station's orbital period?

Part A 

$\boxed{\mathbf{1}\mathbf{ }\mathbf{m}\mathbf{i}\mathbf{l}\mathbf{e}\mathbf{ }\mathbf{=}\mathbf{ }\mathbf{1609}\mathbf{ }\mathbf{m}}$

Orbital speed, v,

$\boxed{\mathbf{v}\mathbf{=}\sqrt{\frac{\mathbf{G}\mathbf{·}\mathbf{M}}{\mathbf{R}}}}$

Height of orbit, H = 230 miles (1609 m / 1 mile) = 0.37 × 10⁶ m

Radius of the Earth, R = 6.37 × 10⁶ m

Radius of the orbit, r = R + H = 6.37 × 10⁶ + 0.37 × 10⁶ = 6.74 × 10⁶ m

Mass, m = 5.98 × 10²⁴ kg

Gravitation constant, G = 6.673 × 10^-11 N.m² / kg²