Three dogs pull on a bone. Dog A pulls north with a force of 10 N and dog B pulls south-east with a force of 20 N.

(a) Draw a parallelogram of forces from dog A and dog B.

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We want to draw a diagram for the given situation, the diagram can be seen below.

So we know the forces that two dogs use to pull a bone.

So the first thing we must do, is to define where are North and East in the coordinate axis.

I will define North as the positive y-axis and East as the positive x-axis.

Because dog B pulls to South-East we can write its force as a vector:

F = (f, - f)

Such that:

Then the diagram has two forces:

The diagram can be seen below.

If you want to learn more, you can read:

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explanation: