Different physical or other systems may have the same or similar models, thus showing the unifying power of mathematical methods. Illustrate this for the system in Figs. 43-45(c) Water in a tube (Fig. 45) what is the frequency of vibration of 5 liters of water (about 1.3gal) in a U-shaped tube of diameter 4cm, neglectingfriction?

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y Fig. 43. Flat spring (Project 8a) L Fig. 44. Torsional vibrations (Project 8b) YA (y=0) Fig. 45. Tube (Project 8c)