77. On a perfectly smooth flat surface is a bar of mass

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77. On a perfectly smooth flat surface is a bar of mass M = 4 kg, attached to the wall of the elastic spring. Bullet mass m = 10 g, flying at a speed of υ0 = 600 m / s and having the time of impact velocity directed along the axis of the spring, hit the bar and got stuck in it. Ignoring air resistance and mass of the spring, to determine the stiffness of the spring and the period of oscillation of the bar with a bullet stuck in it, if the oscillation amplitude A = 10 cm.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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