The following second-order homogeneous linear differential equations model the vibrations of a spring-mass system:                                                       Equation (1): 36 𝑥 ″ + 60 𝑥 ′ + 25 𝑥 = 0 Equation (2): 49 𝑥 ″ + 4 𝑥 = 0 Equation (3): 18 𝑥 ″ + 21 𝑥 ′ + 5 𝑥 = 0 Equation (4): 49 𝑥 ″ + 14 𝑥 ′ + 5 𝑥 = 0 The motion of the spring-mass system modeled by Equation (1) is classified as [ Select ] Underdamped motion Free undamped motion Critically damped motion Overdamped motion . The motion of the spring-mass system modeled by Equation (2) is classified as [ Select ] Underdamped motion Overdamped motion Critically damped motion Free undamped motion . The motion of the spring-mass system modeled by Equation (3) is classified as [ Select ] Underdamped motion Critically damped motion Overdamped motion Free undamped motion . The motion of the spring-mass system modeled by Equation (4) is classified as [ Select ] Overdamped motion Underdamped motion Critically damped motion Free undamped motion .多重下拉选择题

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The following second-order linear differential equations model the vibrations of a spring-mass system: Equation (1): 49 𝑦 ″ + 42 𝑦 ′ + 9 𝑦 = 0 Equation (2): 16 𝑦 ″ + 9 𝑦 = 0 Equation (3): 10 𝑦 ″ + 37 𝑦 ′ + 7 𝑦 = 0 Equation (4): 𝑦 ″ + 6 𝑦 ′ + 58 𝑦 = 0 The motion of the spring modeled by Equation (1) is classified as [ Select ] an overdamped motion a simple harmonic motion. an underdamped motion. a critically damped motion . The motion of the spring modeled by Equation (2) is classified as [ Select ] a critically damped motion an overdamped motion a simple harmonic motion an underdamped motion . The motion of the spring modeled by Equation (3) is classified as [ Select ] a simple harmonic motion an overdamped motion a critically damped motion an underdamped motion . The motion of the spring modeled by Equation (4) is classified as [ Select ] an underdamped motion an overdamped motion a simple harmonic motion a critically damped motion .    

Name the Supreme Court decision that removed financial constraints on PACs.

Political scientists Joshua Kalla and David Broockman find that senior policy makers made themselves available to _____ between three and four times more often than they did to constituents.

Name the political scientist who argues that parties are designed to serve the needs of ambitious politicians (namely candidates and officeholders).

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