PBL: Orbits

IB Physics: PBL: Orbits

(1) All planets move about the Sun in elliptical orbits, having the Sun as one of the foci.(2) A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.(3) The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.A mass is made to travel in a circle on the end of an elastic string.

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