If a rotating object starts at rest and completes one rotation in 4s, what is its angular acceleration assuming its angular acceleration is constant?(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\omega=\frac{2\pi}{t}[/tex]

[tex]\omega=\frac{2\pi}{4}[/tex]

[tex]\omega=\frac{\pi}{2}[/tex]

[tex]\alpha=\frac{\omega}{t}[/tex]

[tex]\alpha=\frac{\frac{\pi}{2}}{4}[/tex]

[tex]\alpha=\frac{\pi}{8}[/tex]

the book says the answer is pi/4, where did I go wrong?

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# Homework Help: Rotating object

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