8.21 The Physics of Energy Fall 2009 For information about

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Air Resistance and Friction 3. Air Resistance and Friction How much energy is lost to air resistance? A Car collides with air molecules, sweeps into wake Details complicated–But basic idea is simple: Car sweeps out tube of area A, accelerates air to ˘v =E air ˘1 2 c d( m air)v2 c d = drag coefficient (typical car: c d ˘1=3) dE air dt ...

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Air Resistance and Friction 3. Air Resistance and Friction How much energy is lost to air resistance? A Car collides with air molecules, sweeps into wake Details complicated–But basic idea is simple: Car sweeps out tube of area A, accelerates air to ˘v =E air ˘1 2 c d( m air)v2 c d = drag coefficient (typical car: c d ˘1=3) dE air dt ...
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Col Kenneth Moll, USAF (Ret.) Mr and Mrs Malcolm Muir, Jr. Lt Gen and Mrs Michael A. Nelson, USAF (Ret.) Mr and Mrs Jacob Neufeld Col Helen E. O’Day, USAF (Ret.) Maj Gen and Mrs John S.Patton,USAF (Ret.) Gen W. Y. Smith, USAF (Ret.) The Journal of the Air Force Historical Foundation Fall 2009 Volume 56 Number 3 Publisher Alfred F. Hurley Editor

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