Find the mass and center of mass of the lamina that occupies the region D and has the given density function p. (Enter your answer as an improper fraction.) D = {(x, y) |0 ≤ y ≤ sin (7 x/L), 0≤x≤ L}; p(x, y) = 19y m = (T, Y) = ( 19L 4 X

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