The figure shows two forces of equal magnitude acting on an object. If the common magnitude of the forces is 4.6 N and the angle between them is 40 degrees, what third force will cause the object to be in equilibrium?
if F is the resultant force, so as follows are its characteristics: F =sqrt (F1² + F2² + F1F2cos40) = sqrt(42.32 + 21.16*0.76)=7.64N the angle between F and F1 or F2 is 20°
