A sky lab of mass 2 x 103 kg is first launched from the surface of earth in a circular orbit of radius 2R and then it is shifted from this circular orbit to another circular orbit of radius 3R. Calculate the energy required
(a) to place the lab in the first orbit
(b) to shift the lab from first orbit to the second orbit.(R = 6400 km, g = 10m/s2)
