Question
Question: A planet orbits the sun in an elliptical path as shown in the figure. Let and be speed of the planet...
A planet orbits the sun in an elliptical path as shown in the figure. Let and be speed of the planet when at perihelion and aphelion respectively. Which of the following relations is correct?
A
B
C
D
Answer
Explanation
Solution
Angular momentum of planet at P,
Where 
is the mass of the planet.
Angular momentum of planet at A,
According to the law of conservation of angular momentum
or