Subject :NSO Class : Class 8
A planet is revolving around the sun in an elliptical
orbit. Which of the following remains constant ?
A Linear momentum
B Angular momentum
C Kinetic energy
D Potential energy
angular momentum is product of velocity and mass the planet mass will remain constant means velocity if changes momentum will also but if velocity is cost then there would be no acceleration or decelaration so the kinetic energy should be constant
Ans 1:
Class : Class 8
The answer is (b) According to Kepler's second law, the angular momentum of the planet is constant. The angular momentum of the planet does not vary, i.e. the aerial velocity of the planet remains constant.