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[Solved] 3 Dimensional Equlibirum - Statics (Astar, plz help)

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SGVaibhav:
Resolved :D

Need help out here, mostly in finding moment about an axis.

1. The problem statement, all variables and given/known data
The member is supported by a pin at A and a cable BC. If the load at D is 300, determine the x, y, z components of reaction at these supports.
i.e Find the reactions at A and the tension in the cable BC

2. Relevant equations
Since it is in equilbrium.



3. The attempt at a solution
The most confusing part for me, is moment about an axis. (If possible, please tell me, how to find moment about an axis - the direct method and through the vector matrix).

Correct me, if i am wrong.

rBC = 0.3i - 0.6j + 0.2k
|rBC| = 0.7
uBC = 1/0.7 (0.3 i - 0.6j + 0.2k)

TBC = |TBC|/0.7 (0.3i - 0.6j + 0.2k)

Now


Az is unknown, so to determine Az - we find moment about the x axis of B.
This will give, Az = 0


TBC = 1050 N.


Ax + 1050(0.3/0.7) = 0
Ax = -450 N


Ay - 1050(0.6/0.7) = 0
Ay = 900N

Thats what i could do max (i think im right), now only moment about Y-axis w.r.t a  and moment about Z-axis is left, w.r.t a again. (May and Maz).
Please tell me how to get this part, with 2-3 methods to get moment about an axis (Direct and through matrix).

Thanks a lot =)

elemis:
May God help you with this question, because I certainly cant :P

SGVaibhav:

--- Quote from: Ari Ben Canaan on June 14, 2010, 06:09:42 pm ---May God help you with this question, because I certainly cant :P

--- End quote ---
i just notified the topic.
if u see astar, plz tell him to solve the moments part with explanation.
im off for now..

elemis:
Send him a PM, if you havent already :)

SGVaibhav:
sent..... but he has not come online from long time.

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