It is known that 8000m/sec is the speed required for an object travelling parallel to the earth's surface to orbit (i.e. so that the centripetal force counteracts the gravity force). I am now thinking to an object linked to an axis of rotation (e.g. with a 1m string) and rotating about that axis with an angular speed (e.g. 80kRPM) so that the linear velocity of the object reaches the above mentioned 8000m/sec. Would that object start to levitate?