Angular acceleration and power

  • Thread starter n.hirsch1
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  • #1
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Homework Statement


See the image attached
What power must be applied to this object to accelerate it from rest to an angular speed of 2.7 rad/s in 5.2 s about the x axis?


Homework Equations


P = W / t - torque * angular velocity


The Attempt at a Solution


P = [(0.5 m)*(7 kg)*(acceleration)] * 2.7 rad/s
I don't know how to find acceleration or if I am doing this wrong all together. The right answer is 1.3 W. I tried plugging it into the motion equation v = vo + at to get a, that gave me the wrong answer.
 

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Answers and Replies

  • #2
Delphi51
Homework Helper
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The work goes into making the system have kinetic energy. Your starting point should be P = KE/time. Now you just have to figure out how much rotational kinetic energy it has when ω = 2.7 rad/s.
 

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