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Panic escape . Figure 2-16 shows a general situation in which a stream of people attempt to escape through an exit door that turns out to be locked. The people move toward the door at speed v_(s)=3.50m//s, are each d=0.25m in depth, and are separated by L=1.75m. The arrangement in Fig. 2-16 occurs at time t=0. (a) At what average rate does the layer of people at the door increase ? (b) At what timedoes the layer'sdepth reach 5.0m ? (The answers reveal how quicklysuch a situation becomes dangerous. ) |
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