Figure Q4. illustrates a rotor assembly with out-of-balance rotor discs in planes A, B and C. The out-of-balance mass x radius products in planes A and C are as indicated in the figure. The out-of-balance mBrB in plane B and its angular position [itex]\Theta[/itex]B are such that the system is in static balance. (a) Determine the values of mBrB and [itex]\Theta[/itex]B. (b) If the system is to be dynamically balanced by adding balancing masses m1r1 and m2r2 in planes A and C, respectively, determine their values and angular positions [itex]\Theta[/itex]1 and [itex]\Theta[/itex]2. Any help is much appreciated!