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  2. Fishing reel - Wikipedia

    en.wikipedia.org/wiki/Fishing_reel

    Parts of a spinning reel: 1: Pick up or bail 2: Reel seat 3: Reel foot 4: Handle 5: Support arm 6: Anti-reverse lever 7: Skirted spool 8: Fishing line 9: Drag adjustment knob A fishing reel is a hand- cranked reel used in angling to wind and stow fishing line , [ 1 ] typically mounted onto a fishing rod , but may also be used on compound bows ...

  3. Spin (physics) - Wikipedia

    en.wikipedia.org/wiki/Spin_(physics)

    Rotating a spin-2 particle 180° can bring it back to the same quantum state, and a spin-4 particle should be rotated 90° to bring it back to the same quantum state. The spin-2 particle can be analogous to a straight stick that looks the same even after it is rotated 180°, and a spin-0 particle can be imagined as sphere, which looks the same ...

  4. Spin model - Wikipedia

    en.wikipedia.org/wiki/Spin_model

    A spin model is a mathematical model used in physics primarily to explain magnetism. Spin models may either be classical or quantum mechanical in nature. Spin models have been studied in quantum field theory as examples of integrable models. Spin models are also used in quantum information theory and computability theory in theoretical computer ...

  5. Relativistic angular momentum - Wikipedia

    en.wikipedia.org/wiki/Relativistic_angular_momentum

    In special relativity alone, in the rest frame of a spinning object, there is an intrinsic angular momentum analogous to the "spin" in quantum mechanics and relativistic quantum mechanics, although for an extended body rather than a point particle. In relativistic quantum mechanics, elementary particles have spin and this is an additional ...

  6. Rabi cycle - Wikipedia

    en.wikipedia.org/wiki/Rabi_cycle

    One example of Rabi flopping is the spin flipping within a quantum system containing a spin-1/2 particle and an oscillating magnetic field. We split the magnetic field into a constant 'environment' field, and the oscillating part, so that our field looks like = + = + (⁡ + ⁡ ()) where and are the strengths of the environment and the oscillating fields respectively, and is the frequency at ...

  7. Fishing rod - Wikipedia

    en.wikipedia.org/wiki/Fishing_rod

    Spin casting rods also have small eyes and, frequently, a forefinger grip trigger. They are very similar to bait casting rods, to the point where either type of reel may be used on a particular rod. While rods were at one time offered as specific "spin casting" or "bait casting" rods, this has become uncommon, as the rod design is suited to ...