anonymous
  • anonymous
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?
Physics
chestercat
  • chestercat
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3psilon
  • 3psilon
|dw:1351209240130:dw|
3psilon
  • 3psilon
|dw:1351209262497:dw|
3psilon
  • 3psilon
|dw:1351209379108:dw|

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3psilon
  • 3psilon
Divide 9500 by 2pi
anonymous
  • anonymous
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
  • NotTim
Both wrong still

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