Question

A particle weighs 120 N on the surface of the earth. At what height above the earth’s surface, will its weight be 30 N ? Radius of the earth = 6400 km.

Answer 1

1

duragpalsingh

duragpalsingh

28.09.2017

Physics

Secondary School

+5 pts

Answered

A particle weighs 120 N on the surface of the earth. At what height above the earth's surface will its weight be 30 N? Radius of the earth = 6,400 km.

2

SEE ANSWERS

Log in to add comment

Answers

Hello

we know

g = GM/r² ----- (1)

If the body taken to the height above earth surface

g = GM/( r + h)² ----(2)

Dividing (2) by (1)

we get ,

1/4 = r²/(r+h)²

Taking square roots on both sides

1/2= r/(r+h)

r + h = 2 r

h = r

h = 6400 k m