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01:27 IWF (Göttingen) German 2004

Elektrischer Wind

At sharp corners, even small voltages can lead to large electric fields. They can ionize the surrounding air, making it electrically conducting.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:03 IWF (Göttingen) German 2003

Zur Vektornatur des Drehimpulses

A ventilator which can rotate freely around a vertical axis can be used to demonstrate that the angular momentum is a vector. A ventilator is mounted so that it can rotate freely around a vertical axis. It can also be tilted so that the air is blown either horizontally or upward. Upon turning on the ventilator, both the propeller and the driven air jet receive an angular momentum. Its vector points in the direction of the jet, parallel to the axis of the propeller. The ventilator receives an equal angular momentum in the opposite direction (opposite sense of rotation). The experiment is carried out for two different orientations of the ventilator.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
01:10 IWF (Göttingen) German 2004

Freie Rotation eines quaderförmigen Körpers

Only the axes of maximum and minimum moment of inertia are free axes of rotation around which a body can rotate stably without mechanical support. Attempts at rotation around other axes lead to wobbling, i.e. unstable rotation. A piece of styrofoam in the form of a parallelepiped (like a cigar box) is thrown into the air while giving it a spin. In order to watch the motion, opposing surfaces have been marked with different colors.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:35 IWF (Göttingen) German 2004

Behnsches Rohr

A balloon filled with a gas lighter than air will rise. This is explained as evidence that the pressure in the heavier air decreases more rapidly with increasing height than that of the lighter gas inside the balloon.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:20 IWF (Göttingen) German 2004

Schwingungen einer Stimmgabel

The sinusoidal vibrations of a tuning fork are made visible by means of a reflected light beam. The tuning fork is excited by compressed air, and can be rotated around its vertical axis. One of its legs carries a small mirror off which a laser beam is reflected onto the wall. By uniformly rotating the tuning fork, the time dependence of its vibration can be demonstrated.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:08 IWF (Göttingen) German 2004

Modellgas und barometrische Dichteverteilung

Random (thermal) motion of gas molecules is simulated using small steel spheres in a container with moving walls. The density distribution in the gravitational field is shown for this model gas.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:56 IWF (Göttingen) German 2004

Wackelschwingungen

The sinusoidal vibrations of a tuning fork are made visible by means of a reflected light beam. The tuning fork is excited by compressed air, and can be rotated around its vertical axis. One of its legs carries a small mirror off which a laser beam is reflected onto the wall. By uniformly rotating the tuning fork, the time dependence of its vibration can be demonstrated.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
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