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18. What are the kepler's Laws that govern themotion of the planets?19. Calculate the average density of earth in term ofg. G and R.20. A cubic block of edge 2 cm and of mass 5 kg iskept on a table top. Calculate

Answer»

Kepler'sthreelaws of planetary motioncan be stated as follows: (1) Allplanetsmove 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.



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