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The earth (mass = 6×10 24 kg ) revolves round the sun with angular velocity 2×10-7 rad/s  in a circular orbit of radius 1.5×108 km. The force exerted by the sun on the earth in newtons, is

(a)       18×1025                                  (b)  Zero

(c)       27 ×1039                            (d)    36×1021

Answer:   d

(32)

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