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ehild

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The final state is when the platform stops, it means does not rotate, is not the final angular velocity zero then??? :rofl:Alem2000 said:Hi my problem is I have a platform that is rotating and it [tex]\omega_0=8\pi[/tex] and the question is how long does it take it to stop. ...

I wanted to use the [tex]\omega= \omega_0+\alpha t[/tex] equation but i dont know final angular velocity .

ehild

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krab

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[tex]0=\omega_0+\alpha t[/tex]

[itex]\alpha[/itex] is actually negative (angular speed decreasing), and you know the initial angular speed, so solve the above equation for t and you're done.

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