2014年3月25日星期二

When the force is big enough, will not be wet towel dry?

Problem description:
Wring a High quality towel, the force will be squeezed the water out of the wet towel. When the force is big enough, the towel will not be dry?
PS a lot of people say that will break, I think enough force should be off, this is the inevitable. But broken before? Water and how much? Hope to have the authority Master solutions are given.

Answer :


Wet towels will automatically become the "dry" in the air, the towels andwater in the air is to achieve balance. So we can clearly know the landlord asked "dry" refers to the towel in water and air waterequilibrium.
In view of wet towels in the air will have the dry (not discussed hereextreme extreme moist air), so the problem can be expressed as theforce is large enough, can speed up the water and air wet towel in thewater balance.
So, when the towel into the water cannot drip, to wring force can workthe problem is.
If you continue to work, the heat can make the towel on the watertemperature is higher, the difference of chemical potential chemical potential and air towel on the water in the water, so quickly from the towel to the air, so as to achieve the balance.
Specifically, wring a towel force to work, it means a towel must constantly be reversed. Reverse the relative sliding between thedistance of towel, moving the slide is the direction of the force.
So if the towel can be reversed, is also the force can continue to work,you can be sure, is completely dry.
In practice, because the towel strength is limited, can not be infinitetorsion, so in the "dry" before the towel on the bad. Imagine water "onemade of metal porous towels", in the dripping water being screwed outif it continues to tighten, the metal towel will be fever, which is attached to the surface of the water will easily be "wring dry".
More high-quality towels in www.towelstorm.com

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