Two satellites of masses "3M" and "M" orbit the earth in a circular orbit of radius Y and "3r" respectively, the ratio of their speed is:
Correct answer: B. Square root of 3 :1
- A. 1:1
- B. Square root of 3 :1
- C. 3:1
- D. 9:1
Explanation
To move in a circular orbit, gravitational force provides centripetal force. Gravitational force between the two is the same as it is a mutual force. For the same reason, distance between the satellites is the same so speed does not depend on radius.
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