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he two shafts a speed-reducer unit are subjected to couples of magnitude M1 = 18 N m and M2 = 7.5 N m, respectively.
he two shafts a speed-reducer unit are subjected to couples of magnitude M1 = 18 N ∙ m and M2 = 7.5 N ∙ m, respectively. Replace the two couples with a single equivalent couple, specifying its magnitude and the direction of its axis.