Emergency, derive or derivative of moment of intertia

Click For Summary

Homework Help Overview

The discussion revolves around deriving an expression for the moment of inertia of masses at the ends of arms, specifically in terms of variables such as length (l), angle (θ), and mass (m). Participants are clarifying the terminology used in the problem statement, particularly the meaning of "derive" in this context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are exploring whether "derive" implies differentiation or simply calculating the moment of inertia. There is a focus on understanding the specific quantities involved and the nature of the problem being posed.

Discussion Status

Some participants have provided clarification regarding the terminology, suggesting that "derive" refers to formulating an expression rather than taking a derivative. The original poster expresses gratitude for the insights, indicating a productive exchange of ideas.

Contextual Notes

The original poster mentions a time constraint, needing to complete the task by the end of the day, which may influence the urgency of the discussion. There is also an indication of cognitive challenges affecting the original poster's ability to process the problem.

Clairepie
Messages
12
Reaction score
0

Homework Statement


Needs to be in TODAY (yeah I know I am cutting it close!)
Derive an expression for the moment of inertia of the masses at the ends of the arms in terms of l, θ and m
Is the example question asking for the derivative or is it asking to use the terms above in an equation.

Homework Equations


I=MR^2
I=[tex]\Gamma[/tex][tex]\alpha[/tex]
R=l sin θ


The Attempt at a Solution


I=(mgl)/(d^2θ/d^2t) or I=2m(l sinθ)^2
It's more the term Derive that is bugging me.

Thanks guys
 
Physics news on Phys.org
Derive doesn't mean differentiate. The problem is simply asking you to calculate I.
 
Clairepie said:
Derive an expression for the moment of inertia of the masses at the ends of the arms in terms of l, θ and m
The moment of inertia of what?
Is the example question asking for the derivative or is it asking to use the terms above in an equation.
I'm guessing (since you didn't give the full problem) that they just want you to express the moment of inertia of some body in terms of those quantities. Not take a derivative! Derive = 'come up with'.
 
Thanks, it seems so obvious now! Having a really bad brain fog day & you've both saved my bacon! I have the rest I think,

Thank you again with extra karma your way

(Cognitive dysfunctional) Claire
 

Similar threads

  • · Replies 27 ·
Replies
27
Views
5K
Replies
8
Views
2K
Replies
16
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 4 ·
Replies
4
Views
3K