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A planet is moving in an elliptic orbit....

A planet is moving in an elliptic orbit. If `T,V,E` and `L` stand, respectively, for its kinetic energy, gravitational potential energy, total energy and angular momentum about the centre of force, then

A

T is conserved

B

U is always positive

C

E is always negative

D

L is conserved but the direction of vector i will continuously change

Text Solution

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The correct Answer is:
C
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MOTION-GRAVITATION-Exercise - 1 (Section - C :- Keplers Law, Orbital Velocity, Escape Velocity + Geo. Stationary Satellites )
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  3. A planet is moving in an elliptic orbit. If T,V,E and L stand, respect...

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  4. The gravitational force between two objects is proportional to 1//R (a...

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  5. What will be velocity of a satellite revolving around the earth at a h...

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  6. Two satellites of masses of m(1) and m(2)(m(1)gtm(2)) are revolving ro...

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  7. Orbital radius of a satellite S of earth is four times that s communic...

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  8. If a satellite is orbiting the earth very close to its surface, then t...

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  9. For two saatellitw at distance R and 7R above the earth's surface, the...

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  10. The minimum projection velocity of a body from the earth's surface so ...

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  11. Geostationary satellite :-

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  12. The maximum and minimum distance of a comet form the sun are 8xx10^(12...

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  13. A satellite of mass m goes round the earth along a circular path of ra...

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  14. Near the earth's surface time period of a satellite is 4 hrs. Find its...

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  15. A communication satellite of earth which takes 24 hrs. to complete one...

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  16. Escape velocity for a projectile at earth's surface is V(e). A body is...

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  17. For a satellite moving in an orbit around the earth, ratio of kinetic ...

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  18. The orbital velocity of an artifical satellite in a circular orbit jus...

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  19. The earth revolves round the sun in one year. If the distance between ...

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  20. A sayellite of mass m revolves in a circular orbit of radius R a round...

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