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Introductory Physics Homework Help
Statics Problem, Moment About an Axis
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[QUOTE="yaro99, post: 4410367, member: 479066"] [h2]Homework Statement [/h2] Problem 3.60: [ATTACH=full]162073[/ATTACH] [h2]Homework Equations[/h2] [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] [h2]The Attempt at a Solution[/h2] 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 [B]Edit: Changed the mistake I made in the second row. Still getting the wrong answer.[/B] [/QUOTE]
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Statics Problem, Moment About an Axis
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