State Kepler’s law of Planetary motion. Name the physical quantities

1.	State Kepler’s law of Planetary motion. Name the physical quantities which remain constant during the planetary motion, point without acceleration.
Answer» (a) Kepler’s I Law (Law of Orbits) : Each planet revolves around the Sun in an elliptical orbit. The sun is situated at one foci of the ellipse. (b) Kepler’s II Law (Law of Areas) : The position vector of the planet from the Sun sweeps out equal area in equal interval of time. That is the areal velocity of the planet around the Sun is constant. (c) Kepler’s III Law (Law of Periods) : The square of the time period of any planet about the Sun is proportional to the cube of the semi-major axis of the elliptical orbit. (i) Mass (ii) Angular Momentum (iii) Total Energy

State Kepler’s law of Planetary motion. Name the physical quantities which remain constant during the planetary motion, point without acceleration.

Answer»

(a) Kepler’s I Law (Law of Orbits) : Each planet revolves around the Sun in an elliptical orbit. The sun is situated at one foci of the ellipse.

(b) Kepler’s II Law (Law of Areas) : The position vector of the planet from the Sun sweeps out equal area in equal interval of time. That is the areal velocity of the planet around the Sun is constant.

(c) Kepler’s III Law (Law of Periods) : The square of the time period of any planet about the Sun is proportional to the cube of the semi-major axis of the elliptical orbit.

(i) Mass

(ii) Angular Momentum

(iii) Total Energy

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