Serway & Jewett — Angular Momentum: Problem 5

Two forces \(\vec{F}_1\) and \(\vec{F}_2\) act along the two sides of an equilateral triangle as shown in Figure P11.5. Point \(O\) is the intersection of the altitudes of the triangle. (a) Find the magnitude of a third force \(\vec{F}_3\) to be applied at \(B\) and along \(BC\) that will make the total torque zero about the point \(O\). (b) What If? Will the total torque change if \(\vec{F}_3\) is applied not at \(B\) but at any other point along \(BC\)?