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A research satellite of mass 200 kg circles the earth in an orbit of average radius 3R/2 where R is the radius of the earth. Assuming the gravitational pull on a mass of 1 kg on the earth’s surface to be 10 N, the pull on the satellite will be

(a)  880 N                                 (b)  889 N

(c)   890 N                                 (d)  892 N

Answer: a

(4)

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