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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
F18–9.   The  60@kg  rod  OA  is  released  from  rest  when u  = 0°. Determine its angular velocity when u  = 45°.  The spring remains vertical during the motion and is unstretched when u  = 0°.
F18–12.   The 20@kg rod is released from rest when u  = 0°. Determine  its  angular  velocity  when  u  = 90°.  The  spring has an unstretched length of 0.5 m.
2 m
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1 m
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O
u
k = 150 N/m
AÂ Â Â Â Â Â Â Â v
k = 100 N/m
u
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Â
3 m                                                                                                       2 m
A
B
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Prob. F18–12
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