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1-29. [KMUTTmidterm 2557] Engine #3 of the aircraft is broken. Both engine #1 and #2 remain operational and are providing 90 kN thrust each. The pilot decides to increase the thrust on Engine #4 to F kN in order to eliminate the resultant yaw moment about the z-axis.
(a) Determine the magnitude of thrust F [5 marks]
(b) Determine the resultant pitching moment about y-axis [5 marks]