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You could start the rotation before descending onto the zipline. Imagine a rotating plate on which a person stands, while being connected to the zipline. Then the platform suddenly lowers itself or he lifts his legs, so he can't reach the platform and is only connected to the zipline. And there you go, he starts descending the zipline and you have the ...


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It depends on the context really, usually torque is used to describe the moment causing torsional stress (so rotating about the same axis as the shaft). While the two other orientations of moment are the bending moment causing normal stress. Couple is just a general term, since any two equal and opposite forces will cause a moment and zero resultant force.


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Dimensional analysis shows that the first formula is consistent with acceleration. In SI units, acceleration is in m/s².


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