Question

. Ten seconds after an electric fan is turned on, the fan rotates at 300 rev/min. Its average angular acceleration is: a. 3.14 rad/s2 b. 30 rad/s2 c. 30 rev/s2 d. 50 rev/min2

Answer 1

Given that the time taken is t = 10s

               Intiialangular angular velocity is ?₁= 0

              final angular angular velocity is ?₂= 300 rev/min = 31.4 rad/s

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         The averageangular accelaration is ? = ( ?₂ - ?₁) /t

                                                                  =(  ?₂- 0)/t            

                                                                  = 31.4 rad/s / 10s

                                                                  = 3.14 rad/s²