Long description: Fig361d

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• The image displays a rectangular shape oriented on a two-dimensional coordinate system with the vertical axis labeled \(y\) and the horizontal axis labeled \(x\).
• The lower-left corner of the rectangle is labeled with the origin point \(O\).
• On the vertical axis, the top edge of the rectangle is labeled \(b\), indicating a height or dimension.
• On the horizontal axis, the right edge of the rectangle is labeled \(\ell\), indicating a length or dimension.
• Inside the rectangular area, text labels indicate physical properties: "density: \(\rho\)" and "thickness: \(t\) (small)".
• The diagram appears to represent a section of material with uniform density \(\rho\) and thickness \(t\) (small) over a length \(\ell\) and height \(b\).