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The amplitude of a torsional vibration decreases so that the amplitude on the 100th cycle is 13% of the the amplitude of the first cycle. Determine the level of damping in terms of the logarithmic decrement.
Is this simply ln(100/13)= 2.04
or ln(13/100)= -2.04?
Is this simply ln(100/13)= 2.04
or ln(13/100)= -2.04?