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P. 126

Angular Acceleration. The  angular  acceleration  α (alpha)
         measures the time  rate of change of  the  angular velocity.  The
         magnitude of this vector is
                                            dω
                                        α  =                                          2-50
                                            dt
              Using Eq. 2-49, it is also possible to express α as













































                        a                                b
                                     Fig. 2-18.


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