Akshay B.

asked • 6d

Static Equilibrium Question

Question Description:

Three cables are connected at a central point B. The first cable runs from point A to point B at an angle 50˚ above the horizontal. Another cable runs from point B to point C. This cable has a horizontal dimension of 12 and a vertical dimension of 5 (creating a pythagorean triple). The final cable runs straight down from point B and is connected to a box, D, that wieghs 500lbs.


Find the tension in each cable.


My Answer(s) so far:

Tension in cable TBD: 500lbs

Tension in cable TAB: -698.846lbs (which doesn't make sense)

Tension in cable TBC: 1003.580lbs


My Work:

I found the tension in cable TBD to be the weight of the box since the ∑F (in the y direction) at box D is zero:

∑F = 0, therefore Fy = W = 500lbs


To find the tension of cables TAB and TBC I found up the following system of equations


TBC*(5/13) + TABsin(50˚) = 500

TBC*(12/13) + TABcos(50˚) = 0


The answer is supposed to be 500lbs for TBD, 483.62lbs for TAB, and 310.86 for TBC

My mistake is somewhere in the system of equations but I am not sure what part is wrong. Thanks!

1 Expert Answer

By:

Jeremy S. answered • 6d

Experienced Physics and Math Tutor

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