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  • The earth revolves round the sun in an elliptical orbit. Its speed is:  Option: 1 going on decreasing continuously  <

The earth revolves round the sun in an elliptical orbit. Its speed is:
 

Option: 1

going on decreasing continuously

 


Option: 2

greatest when it is closest to the sun
 


Option: 3

greatest when it is farthest from the sun
 


Option: 4

constant at all the points on the orbit.


Answers (1)

best_answer

Conservation of angular momentum of the planet yields,

\mathrm{\mathrm{mv}_1 \mathrm{r}_1=\mathrm{mv}_2 \mathrm{r}_2 }

\mathrm{ \Rightarrow \mathrm{v}_1 \mathrm{r}_1=\mathrm{v}_2 \mathrm{r}_2}

\therefore At closest distance speed is maximum.

Hence option 2 is correct.

Posted by

Pankaj

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