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A sky lab of mass m kg is first launched from the surface of the earth in a circular orbit of radius 2R and then it is shefted frm this circular orbit to another circular orbit of radius 3 R. Calculate the energy required :-
(a) to place the lab in the first orbit.
(b) to shift the lab frm first orbit to the second orbit. (R = 6400 km, g= 10 m/s2)
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