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 (10[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. (10[1])The time evolution 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. An LC circuit behaves as one of these systems, (-5[1])as it satisfies the generic differential equation, “mx-double-dot equals minus kx.” For 10 points, Hooke’s law describes the “simple harmonic” type of what systems? ■END■ (10[1])