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![[Post New]](/templates/default/images/icon_minipost_new.gif) 28 Feb 2007 09:27:54 IST
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Planet revolves in an elliptical orbit around the sun.Which physical quantity remains constant?? 1) Velocity 2) Kinetic energy 3) Momentum 4) Angular momentum.
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28 Feb 2007 10:02:56 IST
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4)Angular momentum is conserved.
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ADARSH
NITK Surathkal
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28 Feb 2007 10:23:00 IST
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hi atahrva ,
conceptually speaking angular momentum is right ,but if u do not get an idea yhen try this , since only one option is right so the first 3 options are directly related to verlocity and so if velocity is affected the first 3 are deffintely aff but the fourth one also depends on the radius too so angula momentum is right
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28 Feb 2007 23:35:48 IST
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Kepler's law of equal areas states that the area swept out by a planet in a certain length of time is always the same. It is fairly simple to show that the equal area law amounts to a statement that the planet's angular momentum stays constant.
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The Scientist does not study nature because it is useful; he studies it because he delights in it, & he delights in it because it is beautiful. If nature were not beautiful, it would not be worth knowing, life would not be worth living. Ofcourse I do not here speak of that beauty that strikes the senses, the beauty of qualities & appearances; not that I undervalue such beauty, far from it, but it has nothing to do with science; I mean that profounder beauty which comes from the harmoniuos order of the parts, & which a pure intelligence can grasp. |
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1 Mar 2007 16:08:25 IST
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its angular momentum as one of the thing i.e either velocity or radius then other decreases simultaneously
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