12_P04InstructorSolution

12_P04InstructorSolution - 12.4. Model: Visualize: Assume...

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12.4. Model: Assume constant angular acceleration. Visualize: Solve: The initial angular velocity is () i 2 r a d m i n 60 rpm 2 rad/s. rev 60 s π ωπ ⎛⎞ == ⎜⎟ ⎝⎠ The angular acceleration is 2 fi 0 rad/s 2 rad/s 0.251 rad/s 25 s t ωω α −− = Δ The angular velocity of the fan blade after 10 s is ( ) 2 0 2 rad/s+ 0.251 rad/s 10 s 0 s 3.77 rad/s tt ωωα =+ −= − =
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