Sunday, November 9, 2014

newtonian mechanics - Physical interpretation of time constancy in damped harmonic oscillator


I know that one can mathematically derive and prove that in a damped oscillator (without external driving) the time period of oscillations is a constant. But how can one physically interpret as to why should the time period of oscillations be constant even though there is a resistive medium and decreasing amplitude, meaning the amplitude of oscillations decrease exactly with growing time so as to give a constant time period. How can one explain this absolute miracle physically without the help of equations?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...