Gravitation
Universal law of gravitation, acceleration due to gravity, gravitational potential energy, Kepler's laws, satellites and escape velocity.
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Take a full mock →Q1 · Gravitation · HARD
Two satellites A and B of the same mass are revolving around the Earth in orbits of radii r and 2r respectively. The ratio of their kinetic energies KEₐ/KEᵦ is:
Q2 · Gravitation · MEDIUM
The escape velocity from the Earth's surface is approximately: (Take g = 10 m/s², R = 6400 km)
Q3 · Gravitation · EASY
The acceleration due to gravity at a height h above the Earth's surface, where h is much smaller than the Earth's radius R, is approximately:
Q4 · Gravitation · MEDIUM
The orbital velocity of a satellite revolving close to the Earth's surface is: (Take g = 10 m/s², R = 6400 km)