Q. The earth revolves about the sun in an elliptical orbit with mean radius $9.3 \times 10^{7}m$ in a period of 1 year. Assuming that there are no outside influences
A) The earth’s kinetic energy remains constant
B) The earth’s angular momentum remains constant
C) The earth’s potential energy remains constant
D) All are correct
Explanation
(b) Kinetic and potential energies varies with position of earth $w.r.t.$ sun. Angular momentum remains constant every where
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.