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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?

  • one year ago
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  1. 3psilon
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    |dw:1351209240130:dw|

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  2. 3psilon
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    |dw:1351209262497:dw|

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    |dw:1351209379108:dw|

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  4. 3psilon
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    Divide 9500 by 2pi

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  5. 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

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  6. NotTim
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    Both wrong still

    • one month ago
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