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Unformatted text preview: linear momentum as well. + Force Distance I o one bar I o = 2(1/12)(120)(2.4) 2 Sub in values. Could also break it into two bars, get the same I o . What type of problem? Find: Given: F = 90 N, m DP =60 kg, t=3 sec, = 15 DP EX25.1 Revolving Doors Solution Reflection: Note this is about 17 rev/min. This is a reasonable angular velocity for a revolving door. We did not need to consider linear momentum in this case. Any forces at point O do not create a moment about O and therefore do not appear in the angular impulsemomentum equation. Note that for high speed air resistance will be quite large for a real door....
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 Spring '05
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