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Physical World
Question
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The earth of mass =6×1024 kg revolves around the sun with an angular velocity of 2×10-7 rad/s in a circular orbit of radius 1.5×108 km. The force exerted by the sun on earth is

  • 6×1019 N

  • 18×1025 N

  • 36×1021 N

  • 27×1039 N

Answer

C.

36×1021 N

Here :- Mass of earth Me =6×1024 kg

Angular velocity of earth ω =2×10-7 rad/sec

Radius of circular orbit R =1.5×108 km

                                     =1.5×1011m

 Force exerted on earth by the sun is given by

F= MeRω2

   =6×1024×1.5×1011×(2×10-7)2

   =3.6×1022

   =36×1021 N

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