- #1
yaro99
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Homework Statement
Problem 3.60:
Homework Equations
[itex]M_{AD}= \begin{vmatrix}
\lambda_x & \lambda_y & \lambda_z \\
x_{B/A} & y_{B/A} & z_{B/A} \\
F_x & F_y & F_z &
\end{vmatrix}
[/itex]
The Attempt at a Solution
Looking at the figure, these are the unit vector components for line AD:
[itex]\lambda_x=1 \ m
\\ \lambda_y= 0 \ m
\\ \lambda_z = -0.75 \ m
[/itex]
And these are the coordinates for point B where the force is applied:
[itex]x_{B/A}=0.5 \ m
\\ y_{B/A}= 0 \ m
\\ z_{B/A} = 0 \ m
[/itex]
The force vector for the tension in BG:
[itex]\mathbf{T_{BG}}= 450*(\frac{-0.5\hat{i}+0.925\hat{j}-0.4\hat{k}}{1.125})= -200\hat{i}+370\hat{j}-160\hat{k} \ N[/itex]
Plugging these values into the matrix above, I get -138.75 N*m, but the answer is supposed to be -111.0 N*m
Edit: Changed the mistake I made in the second row. Still getting the wrong answer.
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