L28_phys131_26nov07

L28_phys131_26nov07 - top? Assume that the ladder is...

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Summary for Lecture 28 on November 26, 2007: There were no new concepts; we just demonstrated and solved one statics problem: ( 29 . is rotation CCW 0 equations Two 0 F : Statics positive is CCW sin F r F r i i + = = = × = τ θ θ r F
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A ladder of length L leans against a slippery wall (coefficient of friction μ =0). Alas, the coefficient of friction between ladder and floor is only μ =0.20. What is the smallest angle θ that the ladder can have with the floor and still permit you to climb to its very
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Unformatted text preview: top? Assume that the ladder is massless. L You (mass M) at the top ( 29 ( 29 = = equation 1 equations 2 F : STATICS i i F W Mg N F F ( 29 1 tan sin cos cos sin but sin Mg L sin LMg 180 sin LF ) 180 sin( LMg Mg F Mg N Mg N F . . min for equal use N F F F F F W W y f W f W x = =-= =-=---= = = =-= = =-=...
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L28_phys131_26nov07 - top? Assume that the ladder is...

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