1.

An artificial satellite revolves round the earth with a relative velocity of 800 m/s. If acceleration due to gravity is 9 m/s2 and gravitational force is 3600 N, calculate its kinetic energy.

Answer»

Relatively velocity of satellite, v = 800 m/s

Acceleration due to gravity, g = 9 m/s2

Gravitational force, m.g = 3600 N

∴ Mass, m = \(\cfrac{3600}g\) = \(\cfrac{3600}9\) = 400 kg.

Kinetic energy = \(\cfrac12\) mv2\(\cfrac12\) x 400 x (800)2 J = 128 × 106 J or 128 MJ.



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