- #1
odie5533
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Homework Statement
http://img90.imageshack.us/img90/4989/scanuy8.png
http://img125.imageshack.us/img125/8163/fbdzh7.png
The Attempt at a Solution
Been working on this one for at least an hour now =/
[tex]n_{1}[/tex] is the normal force of the wall on the ladder
[tex]n_{2}[/tex] is the normal force of the ground on the ladder
[tex]\sum F_{x} = f_{s} - n_{1} = 0[/tex]
[tex]f_{s} = n_{1}[/tex]
[tex]\sum F_{y} = n_{2} - m_{ladder}g - m_{weight}g = 0[/tex]
[tex]n_{2} = 150(9.8) = 1470N[/tex]
[tex]\tau = Fdcos\theta[/tex]
[tex]\theta = sin^{-1}(4.5/5) = 64[/tex]
[tex]\sum\tau = (n_{1})(5)cos(64) - (m_{ladder}g)(2.5)(cos(64)) - (m_{weight}g)(5)(cos(64)) = 0[/tex]
[tex]n_{1} = 1131N[/tex]
And since f_{s} = n_{1}, the answer I get is 1131N, which is wrong. If anyone can see where I messed up, I'd greatly appreciate any help.
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