What is the equation for tension in a string?

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SUMMARY

The equation for tension in a string varies based on its characteristics. For a string that oscillates with mechanical waves, the tension is defined by the equation T = m∂²u(x,t)/∂t², where "u" represents the amplitude of the wave. In the case of a massless string hanging from a support and supporting a weight W, the tension at any point along the string is equal to W. Additionally, for a string with weight density μ supporting a weight W, the tension at a point a distance x above the weight is given by T = μx + W.

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My physics book sucks and I can't find the equation for tension in a string, can some one tell me the equation?
 
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The Sword 88 said:
My physics book sucks and I can't find the equation for tension in a string, can some one tell me the equation?


What kind of string??Is it one which oscillates,in which mechanical waves propagate??If so,then it should be
T=m\frac{\partial^{2}u(x,t)}{\partial t^{2}}
,where "u" is the amplitude of the wave which propagates along the "x" axis,or it is the coordinate "y" of a point on the string at point "x" at the moment "t".

Daniel.
 
Or, if the string is massless, hanging from a support and supporting a weight W, then the tension at every point in the string is W. (Your text may have thought you didn't need a formula for that!)

If the string has weight density μ and is supporting weight W, the the tension at a point a distance x above the weight is μx+ W, the total weight below the point.
 

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