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TOPIC :GRAVITATION

Number of questions are 173, Select_Question:

Number of questions are 173, Select_Question:

Q1) The earth ( mass=6 × 1024kg) revolves around the sun with an angular velocity 2 × 10-7 rad/sec in a circular orbit of radius=1.5 × 1011km. The force exerted by sun on earth in newton is ...[ AFMC 1997, 1999]

SOLUTION

Force exerted by sun on the earth is centripetal force.

Centripetal force=mω2r

m=6 × 1024kg

ω=2 × 10-7 rad/sec

r=1.5 × 1011km

substituting values in above equation we get

Centripetal force=6 × 1024 × (2 × 10-7)2 × 1.5 × 1011

=36 × 1021

Answer: (a)