If the law of gravitation, instead of being inverse-square law, becomes an inverse-cube-law a) planets will not have elliptic orbits b) circular orbits of planets is not possible c) projectile motion of a stone thrown by hand on the surface of the earth will be approximately parabolic d) there will be no gravitational force inside a spherical shell of uniform density
Correct options are A) and C) If the law of gravitation becomes an inverce square law, then the planets will have path of form: as f(r)=r3K⇒r=ae±3θ Where a, K ⇒ constants And thus the projectile motion of the stone thrown by hand on earth will be approximately parabolic.
