A reversible one of these objects uses the mathematical expression [read slowly] “four pi squared D over T squared” as an approximation in an experimental setup proposed by Henry Kater. An application to one of these objects illustrates the Berry phase by getting the Hannay (15[1])angle (10[1])through decomposition. Calculating the Lagrangian of one system involving (15[1]-5[1])these objects contains the term (10[1])(*) [read (10[1])slowly] (10[2])“3 (10[1])cosine (10[2])theta-sub-one minus (10[1])cosine (10[2])theta-sub-two”; that dynamical system involves (10[7])two (10[1])of (10[1])these (10[1])objects (10[1])coupled together. (10[2])In (10[1])introductory physics classes, using (10[2])the (10[1])small angle approximation reduces the motion of these systems to simple harmonic (10[2])motion. For 10 points, name these swaying objects that usually consist of a mass attached to the end (10[1])of a string or a rod. ■END■