The collective behavior of many interacting examples of these systems is described in the Kuramoto model. The expression “mu times the quantity 1 minus x-squared” multiplies x-dot in an ODE describing (10[1])one of these systems. (10[1])Long build-ups (10[1])followed by sudden discharges are characteristic (10[1]-5[1])of (-5[1])the (-5[1])“relaxation” type of these systems. Cartwright (10[1])and Littlewood studied (10[1])a nonlinear (10[1])one of these systems named for Dutch engineer Balthasar van der Pol. (10[3])The time (10[2])evolution (10[1])of one type of these (10[1])systems traces an ellipse (10[1])in phase space. The dissipation of one type of these systems is described by their Q-factor. (10[3])An LC (10[1]-5[1])circuit behaves as one of these systems, (10[4]-5[2])as it satisfies the generic differential equation, (10[2])“mx-double-dot (10[1])equals minus kx.” (10[2])For 10 points, (10[1])Hooke’s law describes (10[1])the “simple harmonic” (10[1])type (10[1])of what systems? (10[2])■END■ (10[6]0[2])