107. (a) From Eq. 16-12, Tmk==20π/.45s.(b) For a vertical spring, the distance between the unstretched length and the equilibrium length (with a mass mattached) is mg/k, where in this problem mg= 10 N and k= 200 N/m (so that the distance is 0.05 m). During simple harmonic motion, the convention is to establishx= 0 at the equilibrium length (the middle level for the oscillation) and to write the total energy without any gravity term; i.e., EKU=+,where2/2.Ukx=Thus, as the block passes through the unstretched position, the energy isEk=005225122.( .).J. At its topmost and bottommost points of oscillation, the
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