Calculate Torque/Power for Rotating Tube & Rectangular Parallelepiped

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Discussion Overview

The discussion revolves around calculating the torque and power required to rotate a construction consisting of a tube and a rectangular parallelepiped. Participants explore the necessary parameters and concepts related to moment of inertia, angular velocity, and the dependencies of power on these factors.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant seeks to calculate the torque and power for a construction made of a tube and a rectangular parallelepiped, providing dimensions and masses for both components.
  • Another participant emphasizes the need for an attempt at solving the problem and points out that the power required to rotate an object is dependent on the angular velocity, which is not provided.
  • A later reply requests the calculation of the moment of inertia for the construction instead of torque and power.
  • Another participant suggests calculating the moment of inertia as the summation of two composite bodies and notes that the mass moment of inertia must be about a specified axis, indicating a need for clarity in the problem statement.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the original question regarding torque and power, and there is disagreement about the framing of the problem. The discussion remains unresolved regarding the specific calculations needed.

Contextual Notes

There are limitations in the discussion, including missing assumptions about angular velocity and the specified axis for moment of inertia calculations. The problem statement lacks clarity on these points.

Rem Grwthy
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I want to calculate the torque of the construction or the needed Power (Watt) to rotate it. The construction is a tube and on top of tube is stuck a rectangular parallelepiped:

Tube:

inner diameter=d=92mm, outter diameter=D=102mm, lenght=L=3000mm, mass=12.34kg

Rectangular parallelepiped:

x=3000mm, y=5000mm, z= 50mm, mass=250kg

http://www.ffevents.gr/nikos/sxediopaint.jpg

...Please assume missing data if needed.....
 
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You need to show an attempt of solving this problem on your own. You question is also wrong in the sense that the power to rotate something depends on the angular velocity, which is not given in your problem statement.
 
ok forget about this... But can you calculate the moment of inertia for this construction??
 
You could do it as the summation of two composite bodies. Again, your question is posed wrong because the mass moment of inertia is about a specified axis. You can find the MMOI of the two bodies you have drawn in any standard engineering statics or dynamics book.
 

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