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The period of a satellite of the earth very near to the surface of the earth is T0.  What is the approximate period of the geostationary satellite in terms of   T0? (Height of geostationary satellite above the surface of earth is 36000km)

a
T0/7
b
7T0
c
7T0
d
77T0

detailed solution

Correct option is D

T2 α  r3,  R=6400  km∴  r = (6400 + 36000) km = 42,400 km∴  TT0=rR3/2=4240064003/2  ⇒  T  ≈  77T0

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A body of mass 3 kg is under a force which causes a displacement in it, given by s =t2 / 3 (in m). Find the work done by the force in 2 second


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