Question

Malmberg and Wharton verified a form of this process derived from the Laplace transform on the linearized Vlasov–Poisson equation, which occurs as the inverse of the two-stream instability. This process is introduced into semi-active vehicle suspensions by acting on an MR fluid. This phenomenon occurs when the first-order term in the equation [read slowly] “x-double-dot plus a (-5[1])x-dot plus b x equals zero” does not vanish. (10[1])A form of this process that affects longitudinal plasma waves is named for Landau. (10[1]-5[1])Three types of this (10[1])process are (-5[1])classified by a parameter’s value relative to 2m times the natural frequency. When the Q-factor is one-half, this phenomenon (10[1])occurs critically. (-5[1])For (0[1])10 points, name this phenomenon where energy loss causes the decrease of the amplitude of a harmonic oscillator. ■END■ (10[2]0[2])

ANSWER: damping [or damped or damper; accept damped harmonic oscillation or damped harmonic oscillator; accept critically damped or overdamped or underdamped; accept Landau damping or magnetorheological damper or MR damper; prompt on magnetorheological shock absorber or MR shock absorber by asking “what causes the absorption?”; reject “dampening”]
<Physics>
= Average correct buzz position

Back to tossups

Summary

2023 ACF Winter @ Columbia11/11/2023Y967%0%44%97.17

Buzzes

PlayerTeamOpponentBuzz PositionValue
Austin GuoPrinceton AYale B56-5
Forrest WeintraubColumbia AYale A6510
Jason QinColumbia BNYU A79-5
Jupiter DingPrinceton BPenn B7910
Lexi TermanRutgers ABard A8310
Arjun BothraHaverfordRutgers B85-5
Richard NiuCornell CYale C10410
Sam MacchiVassarPenn A106-5
Danny HanPenn AVassar1070
Nat KuNYU AColumbia B12610
Omar MahmoodNYU BColumbia C1260
Mark TawfikRutgers BHaverford12610
Andrew MinagarYale BPrinceton A1260