JIPMER 2009
- Exam
- JIPMER
- Year
- 2009
- Subject
- Physics
- Chapter
- Gravitation
JIPMER 2009 · Physics · Gravitation
Two satellites of earth, S_1 and S_2 , are moving in the same...
Two satellites of earth, and , are moving in the same orbit. The mass of is four times the mass of . Which one of the following statements is true?
Options
- AThe time period of is four times that of
- BThe potential energies of earth and satellite in the two cases are equal
- C and are moving with the same speed
- DThe kinetic energies of the two satellites are equal
Correct answer
C. and are moving with the same speed
Step-by-step solution
When two satellites of earth are moving in same orbit, then time period of both are equal. From Kepler's third law
Time period is independent of mass, hence their time periods will be equal.
The potential energy and kinetic energy are mass dependent, hence the PE and KE of satellites are not equal.
But, if they are orbiting in a same orbit, then they have equal orbital speed.