Question

The earth revolves about the sun in an elliptical orbit with mean radius $9.3 \times 10 ^ { 7 } \mathrm {~m}$ 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

Answer 1

Answer: (B)

The earth's angular momentum remains constant

Answer 2

Kinetic and potential energies varies with position of earth w.r.t. sun. Angular momentum remains constant every where.