Question

(b) The attraction of the earth on a body above its surface varies
inversely as the square of its distance from the centre of the earth. If
the earth's radius is 4000 miles and a body weighs 5 Kg on its surface,
what will the body weigh 1000 miles above the earth's surface ? ​

Answer 1

Answer:

The weight at the centre of the earth would be zero. As the body moves closer to the centre of the earth the mass of the earth between the centre of the earth and the body keeps decreasing. This causes the force acting from the centre of the earth on the body to decrease.