Problem 3. A water-melon has a shape of a ball of radius 15 cm. It is cut by vertical planes into 10 equal slices. Find the position of the center of mass of such a slice, i.e. its distance from the z-axis.
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Problem 3. A water-melon has a shape of a ball of radius 15 cm. It is cut by vertical planes into 10 equal slices. Find the position of the center of mass of such a slice, i.e. its distance from the z-axis.
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