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 at a distance equal to the radius of the Earth from the surface is g/4, because gravitational force decreases with the square of the distance from the center of the Earth. At twice the Earth's radius (one radius above the surface), 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 $\sqrt { 2 }$