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Newton’s law of motion for rotation clarification

  1. Sep 24, 2014 #1
    Hey guys,
    I'm trying to work through a question but the solution we have been given is extremely vague. I can't seem to figure out what any of the values such as Beta or Tmax are. If I knew how to work those two out, I'm sure I'd be fine from there...

    See attached image.

    Thanks in advance
     

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  2. jcsd
  3. Sep 24, 2014 #2

    Doc Al

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    Staff: Mentor

    It looks like T is the thrust from each motor, so ##T_{max}## would be the maximum thrust. And from Newton's 2nd law for rotation, Torque = I*alpha, you should be able to deduce what Beta is.
     
  4. Sep 24, 2014 #3
    Well seeing as T1 is Tmax...(8N) I get Beta as 888.889...Not sure if it means both T1 and T2. Also what would be the value of t in the second equation at the bottom?
     
  5. Sep 24, 2014 #4

    Doc Al

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    Staff: Mentor

    Careful. What must the total thrust be so as to maintain the height? Also, what value of d are you using?

    The purpose of that equation is to solve for ##t_1##.
     
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