- #1
sapphire4770
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Homework Statement
http://books.google.ca/books?id=nYR... you want the magnitude of the moment&f=false
The above link has a copy of the question. It is question 4.65 on page 144
If you can't see the picture here is the needed information:
pointA(0,8,0)-on tree
pointB(0,0,10)
pointC(14,0,14)
There is a cable from A to B with a tension of 100lb and onother cable from A to C with an unknown tention. If the magnitude of the moment about the origin(0,0,0) is 1500 ft-lb, what is the tension on rope AC?
Homework Equations
M=r * F
The Attempt at a Solution
I know that the moment is equal to the position vector *(cross) the force in cartesian form, but how do you express the 100lb foce in rope AB in cartesian form? Do i even need to?
Also to find the final answer I am thining you have the equation:
1500 = the sum of both moment forces