logo

Ask Questions, Get Answers

 
X
 Search
Want to ask us a question? Click here
Browse Questions
Ad
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Gravitation
0 votes

A planet moves in an elliptical orbit with sun at one of its focii 1) In path QRP work done by gravity is positive . 2) In path PSQ work done by gravity is negative . 3) Linear velocity of rotation from Q to P via R decreases. 4) Gravitational potential energy increases in going from P to Q via R

 

a) 1,2 and 3 are correct b) 1,2 and 4 are correct c) 2,3,4 are correct d) 1,2,4 are correct
Can you answer this question?
 
 

1 Answer

0 votes
In path QRP we are going nearer to the sun. Therefore work is done by the gravity workdone is positive
In path PSQ we are going away from the sun, so work done by the gravity is negative
Gravitational potential energy is a negative quantity thus as we move away from the sun it increases.
The linear velocity $ \alpha \large\frac{1}{radius}$
As we move from Q and P radius decreases so velocity increases.
So 1,2, and 4 are correct
Hence c is the correct answer.
answered Aug 22, 2013 by meena.p
edited Jul 2, 2014 by lmohan717
 

Related questions

Ask Question
student study plans
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...