Question

The value of g will become 10% of its value at the
earth’s surface at a height ? above the surface of
earth. Take radius of earth as 6400 km. Ans : 57,600

Answer 1

Answer:

Let g = acceleration due to gravity at the earth surface.

→gh = acceleration due to gravity at the height (h) = 0.64g.

Now,

0.64g = g R²E/(RE + h)²

=> 0.64 (RE + h)² = R²E

=> 0.8h = 0.2 × RE = 0.2 × 6400

=> h= 2 × 6400/8 = 57,600

Explanation: