The earth revolves about the sun in an elliptical orbit with mean radius
The earth revolves about the sun in an elliptical orbit with mean radius 9.3 × 107 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: b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a