An astronaut goes out for a "space-walk" at a distance above the earth equal to the radius of the earth. What is her acceleration due to gravity at that point?
A) zero
B) g
C) g/2
D) g/4
E) g/ $\sqrt { 2 }$

Question

Quizplus · Accepted Answer

The acceleration due to gravity decreases with the square of the distance from the center of the Earth. At a distance equal to the Earth's radius above the surface, the total distance from the center is twice the Earth's radius, so the acceleration is g/4.

An Astronaut Goes Out for a "Space-Walk" at a Distance 2\sqrt { 2 }2​

An Astronaut Goes Out for a "Space-Walk" at a Distance $\sqrt { 2 }$