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Knowing F 1 and F2 in these two diagrams of college mechanics, can you find F3 and F4? . Find a solution
If the resultant force is zero, the first graph is solvable; if the resultant force is not zero, the first graph is unsolvable.

F 1cos45=F3+F4cos45

F4cos45=F2+F 1cos45

Simultaneously solvable F3 F4

The second graph has no solution, because the included angle between F 1 and F3 is unknown, and the resultant force is not zero. Difficult to solve.

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