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 2 years ago
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?
 2 years ago
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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Algebraic!
 2 years ago
Best ResponseYou've already chosen the best response.07200 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
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