The 83-kg ventilation door OD with mass center at G is held in the open position shown by means of a moment M applied at A to the opening linkage. Member AB is parallel to the door for the 28° position shown. Determine the magnitude of the moment M. M A 0.5 m 0.4 m O C 0.4 m. 0.9 m B 28° G 0.8 m D Answer: M = i ! N-m

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