Problem 9-56 Vector Gravitational Field - B

A spaceprobe is at the position shown in the figure. Use components to determine the gravitational acceleration (magnitude and direction) of the probe due to the effects of the earth and moon. The masses of the earth and moon are \(6.0 \times10^{24}\; kg\) and \(7.4 \times 10^{22} \; kg\), respectively.

Diagram of space probe.

Accumulated Solution


While no orthogonal coordinate system is wrong, this is the most convenient for the problem.

The expression for the gravitational field of a mass \(M\) at a distance \(r\) is;

(A)   \(g = GM/r\)

(B)   \(g = GMr\)

(C)   \(g = GM/r^2\)