Two forces F1 and F2 act along the two sides of an equilateral triangle as shown in Figure P11.9. Point O is the intersection of the altitudes of the triangle. Find a third force F3 to be applied at B and along BC that will make the total torque zero about the point O. What If? Will the total torque change if F3 is applied not at B but at any other point along BC?

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Fo Figure P11.9