The fact that the object "falls" toward the surface, would indicate that gravity is supplying more acceleration (greater than the fictitious centrifugal force).
Thus, I need to find out by how much. This would be 10 \,\, m/s^2 - 9.3 \,\, m/s^2 = 0.3 \,\, m/s^2 .
I am now embarrassed. Thanks...