A geostationary satellite orbits the Earth from: MCQ with Answer and Explanation

Explanation:
Equal masses elastic collision: velocities swap. Moving mass stops, stationary moves with 4 m/s.

Explanation:
Assertion is true: g is about 9.78 m/s² at equator vs 9.83 m/s² at poles. Reason is true and correctly explains A: Earth's rotation creates centrifugal acceleration outward, maximum at equator (radius of rotation = Earth's radius), reducing effective g. Additionally, equatorial bulge increases distance from center, further reducing g. Memory tip: 'Rotation effect: g_effective = g - ω²R cos²φ'. This assertion-reason question tests nuanced understanding of gravity variation, common in competitive exams. Always verify both statements independently before assessing the explanatory link.

Explanation:
R ∝ L/A. New L'=2L, A'=A/2 => R' = ρ(2L)/(A/2) = 4ρL/A = 4R. Alternatively, volume constant? Not given, here both changed independently. So 4R.