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166. The earth revolves around the sun in an elliptical orbitwith mean radius 9.3 x 107 m in a period of 1 yearAssuming that there are no outside influences, then(a) The earth's potential energy remains constant(b) The earth's kinetic energy remains constants(c) The earth's angular momentum remains constant(d) The earth's linear momentum remain constant |
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Answer» option C the angular momentum of the earth is conserved ( taking the sun as the origin) because gravitational force is a central force ,hence it has the functional form f(r)r^ .by definition of torque, torque on earth = rr^ * f(r)r^=0.Thus angular momentum of Earth is conserved .hope that helps. |
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