Posted by sony on Saturday, October 13, 2012 at 12:16am.
The removed portion has 3/4 the diameter and 9/16 of the area and mass M of the full circular (56 cm dia) plate.
Measure CM location from the center of the larger full circle. The center of the cutout circular hole is 7 cm from the center of the large circle
[M - (9/16)M]*x = M*0 - (9/16)M*7
(7/16)x = -63/16
x = 63/7 = -9.0 cm
The CM is 9 cm from the center of the large circle, in the opposite direction from the center of the removed circle
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