{
  "annotation_id": "94d39bba-4390-4ece-a4ea-b60d360b26c1",
  "date_created": "2026-03-02T18:01:21.426000Z",
  "date_modified": "2026-03-02T18:01:21.426000Z",
  "file_hash": "01d9e62367311c3872202ece318fddf6c2088348bc8070c20bd482e6e39de671",
  "private": false,
  "record": {
    "abstract": "The U-CAS is a spinning magnetized top that is levitated in a static magnetic\nfield. The field is produced by a permanent magnet base, positioned below the\nhovering top. In this paper we derive upper and lower bounds for h - the\nmaximum hovering height of this top. We show that the bounds are of the form\na*L where a is a dimensionless number ranging from about 1 to 12, depending on\nthe constraints on the shape of the base and on stability considerations, and L\nis a characteristic length for the problem. For modern permanent magnets we\nfind that L=~1[meter], thus limiting h to about few meters.",
    "arxiv_id": "physics/9902002",
    "authors": [
      "Shahar Gov",
      "Shmuel Shtrikman"
    ],
    "categories": [
      "physics.class-ph",
      "physics.gen-ph"
    ],
    "title": "How High Can The U-CAS Fly?",
    "url": "https://arxiv.org/abs/physics/9902002"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a7b86554-9bb4-4812-b1ee-edee116e1a9d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}