The resultant of two forces 1 and P, is perpendicular to 1 and equal to 1. What is the value of 'P' and angle between the forces?

1 answer

without loss of generality, we can set it up so that the two unit vectors are along the x and y axes. So, if P = <x,y>

<0,1>+<x,y> = <1,0>
<x,y> = <1,0>-<0,1>
<x,y> = <1,-1>

I think you can take it from there, eh?