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