2 require "../eruby_util.rb"
10 \emph{Top:\/} A series of images from a film of the Tacoma Narrows Bridge
11 vibrating on the day it was to collapse. \emph{Middle:\/} The bridge immediately
12 before the collapse, with the sides vibrating 8.5 meters (28 feet) up and
13 down. Note that the bridge is over a mile long. \emph{Bottom:} During and
14 after the final collapse. The right-hand picture gives a sense of the
15 massive scale of the construction.%
17 {'opener'=>'tacoma-collage','sidecaption'=>true,'anonymous'=>true}
22 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
24 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
30 <% begin_hw('stereopower') %>__incl(hw/stereopower)<% end_hw() %>
34 <% begin_hw('swimbladder') %>__incl(hw/swimbladder)<% end_hw() %>
38 <% begin_hw('qcorrection',nil,{'calc'=>true}) %>__incl(hw/qcorrection)<% end_hw() %>
42 <% begin_hw('qproof') %>__incl(hw/qproof)<% end_hw() %>
46 'hw-spider-oscillations',
47 %q{Problem }+ref_workaround('hw:spider-oscillations')+%q{.},
52 <% begin_hw('spider-oscillations') %>__incl(hw/spider-oscillations)<% end_hw() %>
55 <% begin_hw('maxampatdc') %>__incl(hw/maxampatdc)<% end_hw() %>
59 <% begin_hw('fwhm',2,{'calc'=>true}) %>__incl(hw/fwhm)<% end_hw() %>
61 <% begin_hw('qsix') %>__incl(hw/qsix)<% end_hw() %>
68 <% begin_ex("Resonance") %>
69 1. Compare the oscillator's energies at A, B, C, and D.
71 \widefignocaptionnofloat{../../../share/mechanics/figs/ex-resonance-1}
73 2. Compare the Q values of the two oscillators.
75 \widefignocaptionnofloat{../../../share/mechanics/figs/ex-resonance-2}
77 3. Match the x-t graphs in \#2 with the amplitude-frequency graphs below.
79 \widefignocaptionnofloat{../../../share/mechanics/figs/ex-resonance-3}
82 %%---------------------------------------------------------
84 <% if false then figure_in_toc("tacoma") end %>