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Show that the centre of mass of the quarter circular portion ACD is at a distance 4a/π from the bounding radii AC and CD.

Mathematics

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Part (i): Show that the centre of mass of the quarter circular portion ACD is at a distance 4aπ\frac{4a}{\pi} from the bounding radii AC and CD.

  1. Identify the properties of the quarter circle.

    The quarter circle ACD has its center at C and radius R=AC=CD=3aR = AC = CD = 3a.

  2. Apply the formula for the center of mass of a quarter circle.

    For a quarter circle of radius RR, the coordinates of its center of mass from the center of the circle, along the bounding radii, are (4R3π,4R3π)(\frac{4R}{3\pi}, \frac{4R}{3\pi}).

  3. Substitute the given radius

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