Question

Calculate the percentage decrease in the weight of a body when it is taken 32 km below the surface of the earth.
( Radius of the earth = 6400 km)

Answer 1

Here d= 32 km R= 6400 km

weight of body at depth d is mg`

=mg(1-d/R)%

decrease in weight =( mg- mg`)/mg × 100= 32 / 6400×100 = 0.5%.