The meter stick in the drawing can rotate about an axis located at the 20.0-cm mark. the axis is perpendicular to the screen. a force f acts at the left end; the force is perpendicular to the meter stick and has a magnitude of 175 n. a second force, either f1 or f2, acts at the 80.0-cm mark, as the drawing shows. the meter stick is in equilibrium. which force, f1 or f2, acts on the meter stick, and what is its magnitude?