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**[SOLVED] Mechanics Question**

Hey.

I have a quick question relating to what I think is resolving forces. I am stuck at the first hurdle, I have no idea how to approach it.

**Question**

The forces P and Q act on a particle. The force P has a magnitude of 7N and acts due north. The resultant of P and Q is a force of magnitude 10N acting in a direction with bearing 120. Find:

**(a)**the magnitude of Q

**(b)**the direction of Q, giving your answer as a bearing.

**Attempt**

No idea, but as there isn't going to be a right angle in this case, I would assume this question would involve the cosine rule? Could someone please give me a nudge in the right direction.

**Thanks**

**_Mayday_**