MDCAT
Physics
2019
Physics · Circular Motion & Momentum
Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.
Question
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:
Options
- 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.
Tagged under Physics · Circular Motion & Momentum · 2019