What is the significance of 2pie in the power formula?

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Discussion Overview

The discussion revolves around the significance of the term 2π in the power formula, particularly in the context of rotational motion and its relationship to linear displacement. Participants explore the mathematical implications of this term in relation to revolutions and circular motion.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions the role of 2π in the power formula, seeking clarification on its significance.
  • Another participant suggests that the presence of 'revolutions' indicates a connection to circular motion, implying that 2π relates to the circumference of a circle.
  • A different participant proposes that 2π represents one complete revolution in radians and connects it to the calculation of displacement in circular motion.
  • One participant advises caution regarding terminology, suggesting that 'distance' may be a more appropriate term than 'displacement' in this context.
  • Another participant outlines the equations for power, noting the relationships between force, torque, and their respective velocities.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the significance of 2π, with some agreeing on its connection to circular motion while others provide different perspectives on the terminology and relationships involved. The discussion remains unresolved in terms of a definitive explanation of 2π's role.

Contextual Notes

There are limitations in the discussion regarding the derivation of the power formula and the specific assumptions made about the terms used, such as 'displacement' versus 'distance.'

shayrgob
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The equation for power is:

F X 2pie X Revolutions

My question is, what is the 2pie for? I know that might seem obvious but I just can't see it.

thanks!
 
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I haven't seen the derivation of the formula, nor ever heard of it before. However, since there are 'revolutions' mentioned, the 2pi would imply that mathematically, the power is dependent somewhat upon circles. Given [tex]C=2\pi r[/tex]
 
I think I figured it out. 2pi = 6.28 radians, which is 1 complete revolution. So in the power formula you have Force X Displacement. To figure out displacement in a circle you take 2pi X the # of revolutions. I get it!
 
Yep that sounds about right. Just be weary about your terminology though. I believe the correct term would be distance rather than displacement in this case.
 
The equations for power are force times linear velocity, or torque times angular velocity.

The relationsips between angular and linear:

force = torque / radius
linear velocity = angular velocity x radius
 

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