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8 problems. P1: 'ISS orbits at 400km altitude (R_Earth=6400km). Orbital radius = ___ m' (6.8×10⁶). P2: 'Orbital speed at this radius (M_Earth=6×10²⁴, G=6.67×10⁻¹¹) = ___ m/s' (≈7670). P3: 'Orbital period = ___ minutes' (≈92). P4: 'A satellite has period 24 hours (geostationary). Orbital radius = ___
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