Physics

Problem

Point X is at a distance

d

from the centre of Earth.

d

is larger than the radius of Earth. The gravitational field strength at X is

g_x

. Point Y is at a distance

3d

from the centre of Earth. What is the difference in the magnitude of gravitational field strengths between X and Y? A.

\frac{8g_x}{9}

\frac{3g_x}{4}

\frac{g_x}{4}

\frac{g_x}{9}