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What is the braking tension of the cardboard line?

The unit of tension is Mn/m, Mn/m= 103*N/m, that is, 0.005438+0 Newton /m, and the unit of surface tension is NewtoN/m in SI system, but dyne/cm is still commonly used. Dyne is the unit of force, 1 dyne = 10 Newton, so: 1 dyne/cm =1Mn/m.