Tension in System: 4.22 kN | Working Explained

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goldfish9776
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Homework Statement


I was asked to find the tension in CD in this question . The ans given is 4.22kN.
my working is arc tan (surd 13)/12, tetha = 16.7 degree
CD cos (16.7) = 20kN
CD= 21kN.
p/s: i have used pythagora's theorem to fe the surd 13

Homework Equations

The Attempt at a Solution

 

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I don't think there can be tension in member CD.
 
goldfish9776 said:

Homework Statement


I was asked to find the tension in CD in this question . The ans given is 4.22kN.
my working is arc tan (surd 13)/12, tetha = 16.7 degree
CD cos (16.7) = 20kN
CD= 21kN.
p/s: i have used pythagora's theorem to fe the surd 13

Homework Equations

The Attempt at a Solution

The diagram is very unclear. I'm not sure what the various distances refer to, or where the A and B points are in space. Is there a verbal description that goes with it?
 
paisiello2 said:
I don't think there can be tension in member CD.
actually I'm asked to find tension in CD, AD , and BD. I've found Cd only . I have no idea at all for AD and BD
 
haruspex said:
The diagram is very unclear. I'm not sure what the various distances refer to, or where the A and B points are in space. Is there a verbal description that goes with it?
the book stated ' determine the load in each member of the frame shown in Figure .'
 
goldfish9776 said:
the book stated ' determine the load in each member of the frame shown in Figure .'
Well, I cannot interpret the diagram. If it is clear to you, please explain your interpretation ( provide co-ordinates for each of the points).