Question

At what height from the surface of earth the gravitation potential and the value of g are - 5.4 x 10⁷ J kg^-1 and 6.0 m s^-2 respectively? Take the radius of earth as 6400 km.

(a) 1400 km

(b) 2000 km

 (c) 2600 km 

(d) 1600 km

Answer 1

Correct option (c) 2600 km 

Explanation:

Gravitation potential at a height h from the surface of earth,  V_h = - 5.4 x 10⁷ J kg^-1

At the same point acceleration due to gravity g_h = 6 m s^-2