the circuit capacitance
That 100 pops up for the omega.
With small approximation I would say that you have a 16.7 Hz system :) one of my favorite ;), the supply of a Swiss, German, Austrian, Swedish railway. 2 * pi * 16.6667 Hz = 104.7 rad/s. (thanks @user2233709)
Otherwise it is just a good round number without physical explanation (I do not think it is easy to find a system with 15.915 Hz of fundamental).
Note: that 100 confirmed by the &quot;100 rad/s&quot; used one line below.