Ashley1593

A computer hard disk starts from rest, then speeds up with an angular acceleration of 190rad/s2 until it reaches its final angular speed of 7200rpm. How many revolutions has the disk made 10.0s after it starts up?

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3psilon

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3psilon

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3psilon

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3psilon

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Divide 9500 by 2pi

Algebraic!

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7200 rpm = 754 rad.s/sec
\[\omega _{f} = \omega _{i} + \alpha t\]
\[754 = 190t\]
t= 4
\[\theta = 754*6 + \frac{ 1 }{ 2 } 190*(4^2)\]
theta = 4534 + 3039.5
=7563.5 radians
=1203 rev.s

NotTim

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Both wrong still