Page 54 - eEISBN FINALIZE
P. 54

Solution

               Free body diagram


                                                             B

                   Ay

                                                                                             Y=6.93m


                 A           30                               D                    C
                               0
         Ax

                                      12m                            X=4m



                                                           3000N                       Cy
                                                              6.93
                        Y                             tan   60 =
                tan   30 =                                      X
                        12                                     6.93
                           Y =  tan   30  x  12                  X =
                          =   6.93m                                   tan   60
                                                                =    4     m



               MA       =   mA
                     12 =
                              16
               3000 ( ) C   y ( )
                            36000
                              C =
                         y
                              16
                                   =  2250

                 F =  F 
                A +  C =  3000
                       y
                  y
                          A  y  =  3000 - C y
                                = 3000 - 2250

                               =  750N
                 →       
                 F =   F x
                   x
                A x  =  0











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