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
(33)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)