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01:21 IWF (Göttingen) German 2003

Bestimmung des elektrischen Erdfeldes

The electric field of the earth will be determined. A parallel plate capacitor of area 1 m2 is attached to the end of a long bamboo pole. The capacitor is connected to a ballistic galvanometer calibrated to measure current pulses (charges). On a balcony outside the lecture hall, the capacitor is held with its plates horizontal.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
01:48 IWF (Göttingen) German 2004

Reflexionskegel

The reflection of light is demonstrated using a polished steel tube. The reflected light has the shape of a cone.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
04:49 IWF (Göttingen) German 2003

Freie und erzwungene Schwingungen eines Drehpendels (Pohlsches Rad)

Basic properties of harmonic oscillators on a torsional pendulum, specifically their free and driven oscillations. For the latter, the transient oscillations will be shown, before the steady state has been reached. The torsional pendulum consists of a circular copper ring with an eddy current brake, and a torsional spring. One end of the spring is attached to the copper ring, the other end to a motor via an eccentric-and-rod mechanism. For the experiment, another pendulum, also specifically designed for lecture demonstrations, will be used. It sits on an optical bench and is projected onto the front wall of the lecture hall, together with a meter indicating the exciting frequencies used for the driven oscillations. Two pointers, one attached to the pendulum, the other to the eccentric-and-rod mechanism used for moving the spring, allow observation of the phase difference between the exciting torque and the angular displacement of the pendulum.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
01:32 IWF (Göttingen) German 2003

Kreiselkompass

Principle of a gyrocompass using a bicycle wheel on a rotating chair. A bicycle wheel in a fork is mounted on a chair. The fork is free to rotate around its axis which is inclined 45 degrees away from the vertical. As the chair rotates, the center of the wheel moves on a circle. The motion of its axle is observed by an experimenter on the chair, and also by a stationary observer (the movie camera). With the chair at rest, the wheel is started to spin, its angular momentum vector pointing in an arbitrary direction. When the chair is rotated, the axle of the wheel begins to oscillate. The oscillation is damped, and after a few periods, the axle of the wheel (which indicates the direction of its angular momentum) points towards the axis of rotation of the chair. When the chair is made to rotate in the opposite direction, the wheel flips 180 degrees, and after a few periods of oscillation again points towards the axis of the chair.
  • Published: 2003
  • 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
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