Q. In the video of gravitation chapter, in the third law of Kepler's, it is said that, the square of the time period of a revolution for a pair of planets is a directly proportional to the cube of the semi major axis. But in our NCERT textbook it is given for a planet. Is this law is applicable for a pair of planets or for a single planet ?

Q. In the video of gravitation chapter, in the third law of Kepler's,

1.	Q. In the video of gravitation chapter, in the third law of Kepler's, it is said that, the square of the time period of a revolution for a pair of planets is a directly proportional to the cube of the semi major axis. But in our NCERT textbook it is given for a planet. Is this law is applicable for a pair of planets or for a single planet ?
Answer» Q. In the video of gravitation chapter, in the third law of Kepler's, it is said that, the square of the time period of a revolution for a pair of planets is a directly proportional to the cube of the semi major axis. But in our NCERT textbook it is given for a planet. Is this law is applicable for a pair of planets or for a single planet ?

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