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    Two forces P and Q, act on a particle. The force P has magnitude 5N and the force Q has magnitude 3N. The angle between the directions of P and Q is 40 degrees. The resultant of P and Q is F.

    a) Find, to 3 significant figures, the magnitude of F.

    F= 3.32 N

    b) Find, in degrees to 1 decimal place, the angle between the directions of F and P

    Is a) correct? and how do I do b)?

    Um, part a is wrong, first of all Draw a diagram. Make one of the forces horizontal, so that you have one less component. Now resolve the components.

    Ie, Horizontal component = 5cos40 + 3
    and vertical = ...

    Then you can draw a right angled Triangle with these values and then the Hypotenuse will be your resultant

    For part B, use trig on your Right angle triangle to find the angle and then you compare this with P's angle.

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