JEE MainPhysicsGravitationMCQ+4 / −1
Given below are two statements: Statement I: If be the total energy of a satellite moving around the earth, then its potential energy will be . Statement II: The kinetic energy of a satellite revolving in an orbit is equal to the half the magnitude of total energy . In the light of the above statements, choose the most appropriate answer from the options given below
- ABoth Statement I and Statement II are incorrect
- BStatement I is incorrect but Statement II is correct
- CStatement I is correct but Statement II is incorrect
- DBoth Statement I and Statement II are correct
View written solutionFree
Correct answer: A
- Recall the energy relations for a satellite in a bound circular orbit
For a satellite of mass orbiting Earth of mass at radius :
- Gravitational potential energy:
- Orbital speed from gravitational force providing centripetal force:
- Hence kinetic energy:
- Find total energy
So for a satellite in orbit: and
since
- Check Statement I
Statement I says: potential energy is .
But actually, not
So Statement I is incorrect.
- Check Statement II
Statement II says: kinetic energy is equal to half the magnitude of total energy .
Now, And
Thus kinetic energy is equal to the full magnitude of total energy, not half of it.
So Statement II is also incorrect.
- Choose the correct option
Therefore, both Statement I and Statement II are incorrect.
So the correct option is:
- Comparison with stored answer
Stored correct answer:
My derived answer also is , so they agree.
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