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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 6 - Gravitation > Two stars of masses 3×10^31 kg each, and at distance 2×10^11 m rotate in a plane about their common centre of mass O. A meteorite passes through O moving perpendicular to the star’s rotation plane. In order to escape from the gravitational field of this double star, the minimum speed that meteorite should have at O is : (take Gravitational constant G=6.67×10^11Nm 2kg^−2 )

Two stars of masses 3×10^31 kg each, and at distance 2×10^11 m rotate in a plane about their common centre of mass O. A meteorite passes through O moving perpendicular to the star’s rotation plane. In order to escape from the gravitational field of this double star, the minimum speed that meteorite should have at O is : (take Gravitational constant G=6.67×10^11Nm 2kg^−2 )

A rocket has to be launched from earth in such a way that it never returns. If E is the minimum energy delivered by the rocket launcher A source of sound is approaching an observer with speed of 30ms and the observer is approaching the source with a speed 60 ms". Then the fractional change in the frequency of sound in air (330ms) is Two stars of masses 3×10^31 kg each