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. (A): Comets move around the sun in ell...

. (A): Comets move around the sun in elliptical orbits. The gravitational force on the comet due to sun is not normal to the comet.s velocity but the work done by the gravitational force over every complete orbit of the comet is zero
(R): Gravitational force is a non conservative force.

A

Both .A. and .R. are true and .R. is the correct explanation of .A.

B

Both .A. and .R. are true and .R. is not the correct explanation of .A.

C

A. is true and .R. is false

D

.A. is false and .R. is true

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-WORK, POWER & ENERGY -EXERCISE - I
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  8. (A): A spring has potential energy, both when it is compressed or stre...

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  11. A) For any collision, momentum transfer takes place. B) In any colli...

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  13. A) When external forces are involved, momentum of the system is not co...

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  14. A) When a ball hits a wall (stationary) it returns back with same velo...

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  15. For a system to follow the law of conservation of linear momentum duri...

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  16. Consider the following statements A and B. Identify the correct choice...

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  17. . (A): Comets move around the sun in elliptical orbits. The gravitatio...

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  18. . A sphere A moving with a speed .U. and rotating with an angualr velo...

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  19. A body is in motion and it is stopped by applying retarding force. Ini...

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  20. (A): When two bodies of equal masses collide, their veloctities are al...

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