Final answer:
To determine the magnitudes of forces Fu1 and Fu2 in equilibrium, one must apply the principles of static equilibrium, using equations that relate forces and torques to the given conditions. Additional information such as angles, lever arms, or force magnitudes would be necessary to solve for the specific values of Fu1 and Fu2.
Step-by-step explanation:
To find the magnitudes of forces Fu1 and Fu2 that are keeping the object in equilibrium, we need to apply the principles of static equilibrium which considers both the balance of forces (net force is zero) and the balance of torques (net torque is zero).
The question references various figures and equations from a physics textbook that is apparently focusing on the concepts of equilibrium. The given Equation 12.13, -0.52(dx)w +0.48xw = 0, is specifically for setting up the condition for equilibrium of torques.
The question also references a demonstration where forces are applied on a rigid square in two dimensions, observing the conditions for static equilibrium.
In order to solve for the forces, we need additional information such as the angles of the forces involved, their points of application or the lever arms if the context is torques. Since typical solutions for these types of problems involve either graphical methods or trigonometry to resolve forces into components and then apply the equilibrium conditions.
For example, if you are given the resultant force (Ftot) and the angle of F1 and F2 with respect to Ftot, you could use trigonometry to find their magnitudes.