Ncert Exercises & Solutions

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 are not possible.
(c)	the 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.

Choose the correct alternatives:
1. (a), (d)
2. (a), (c)
3. (c), (d)
4. (b), (d)