7) (4 pts.) Let D be solid hemisphere z? +y² + z² < 1, 2 2 0. The density function is 6 = 2. We will tell you that the mass is m="/4. Use SPHERICAL COORDINATES and find the z-coordinate of the center of mass. Hint: You need My- 7=??? p sin (6) dp dộ do p. 0-??? : 0-??? 0: 0- 27.

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