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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Moment Balance
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Two known forces, and a third with known magnitude act on a rigid body.  Apply ΣM=0 about a pin restraint to determine the direction of the third force.  The problem has two valid answers.