Finding Second Moment of Inertia for Shaded Area Through Centroid?

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Homework Help Overview

The discussion revolves around determining the second moment of inertia for a shaded area with respect to the horizontal and vertical axes through the centroid. Participants are analyzing the implications of the axes chosen for the calculations and their relation to the provided figures.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the appropriateness of the axes used for the calculations, particularly in relation to the centroid and the figures provided. There is an exploration of whether certain values for y are valid based on the axes drawn through the centroid.

Discussion Status

The discussion is ongoing, with participants clarifying the relationship between the axes and the figures. Some guidance has been offered regarding the need to refer to the text for proper context, but no consensus has been reached regarding the specific values or methods to be used.

Contextual Notes

There is an indication that the axes used for calculations differ from those shown in the figures, which may lead to confusion. Participants are encouraged to refer to the text for clarity on the setup.

werson tan
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Homework Statement


determine the second moment of inertia about the horizontal axis and vertical axis for the shaded area with respect to x and y axes through the centroid of the area .

Homework Equations

The Attempt at a Solution


Since the x and y axes is drawn thru centroid , why not the y for part 1 = 0mm ? y for part 2 = -30mm?
 

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werson tan said:

Homework Statement


determine the second moment of inertia about the horizontal axis and vertical axis for the shaded area with respect to x and y axes through the centroid of the area .

Homework Equations

The Attempt at a Solution


Since the x and y axes is drawn thru centroid , why not the y for part 1 = 0mm ? y for part 2 = -30mm?
Because the axes being used for the calculation are not the same ones shown in Fig. 6.7. The calculation axes are shown at the lower right-hand part of the page, just above the table.

You must read the text in order to follow what is going on; you can look at one picture and assume it applies regardless.
 
SteamKing said:
You must read the text in order to follow what is going on; you can look at one picture and assume it applies regardless.
You meant 'cannot', right?
 
haruspex said:
You meant 'cannot', right?
Yes.
 

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