The variation of acceleration due to gravity g with distance d from centre of the earth is best represented by
(R=Earth’s radius) :
If the Earth has no rotational motion, the weight of a person on the equator is W. Determine the speed with which the earth would have to rotate about its axis so that the person at the equator will weigh W. Radius of the Earth is 6400 km and g=10 m/s2.
The mass density of a spherical body is given by ρ (r)= for r ≤ R and ρ (r)=0 for r > R, where r is the distance from the centre. The correct graph that describes qualitatively the acceleration, a, of a test particle as a function of r is