Chapter 5

Centripetal Force & Gravity

Example 11 Solution

We need to find the forces between two of the masses at a time. We use Newton's Universal Law of Gravitation and then plug in the numerical values:

Now the other pair:

Then we must add these as vectors. We can use Pythagorean Theorem and then use tangent to find the angle.

Now the angle:

Which means that the answer is:

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