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A portion of a mechanical coin sorter works as follows: Pennies and dimes roll down the 20 incline, the last triangular portion of which pivots freely about a horizontal axis through O

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A portion of a mechanical coin sorter works as follows: Pennies and dimes roll down the 20 incline, the last triangular portion of which pivots freely about a horizontal axis through O. Dimes are light enough (2.28 grams each) so that the triangular portion remains stationary, and the dimes roll into the right collection column. Pennies, on the other hand, are heavy enough (3.06 grams each) so that the triangular portion pivots clockwise, and the pennies roll into the left collection column. Determine the moment about O of the weight of the penny in terms of the slant distance s in millimeters.