Question: 4. A block is hanging from a triangular structure as in figure below. u is the pull by a diagonal rod, and v is the


4. A block is hanging from a triangular structure as in figure below. u is the pull by a diagonal rod, and v is the push by a horizontal rod. The structure is in equilibrium, so that u+ v +w = 0. Assume that the figure is on a (vertical) plane, j points straight up and i points in the same direction as v. Note that 0
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