Finding Limit t->0: H'(r) and τ(r)

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In summary, the limit t->0 for H'(r) and τ(r) is used to determine the instantaneous rate of change and slope of a curve at a specific point. It is calculated using the standard limit definition and provides information about the derivative of a function and the tangent line to the curve. It is important in various fields such as physics, engineering, and economics, as it allows for analysis and predictions of a function's behavior. This limit can be used for any type of function as long as it is continuous.
  • #1
urbanist
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Hi all,

If we have
[itex]H'(r)=r+\tau(r)H(r)[/itex]

and

[itex]\tau(r)=k+(H(r)/r)^a[/itex]

where

[itex]a>0, k>0, [/itex] and [itex]H(0)=0[/itex],

can we say anything about [itex]{lim}_{r\rightarrow 0^+}\tau(r)[/itex]?

Thanks a lot!
 
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  • #2
Sure you can.
Note - the trouble with evaluating the limit just by putting r=0 is the 0/0 in the second term right?
So what role would the slope of H play in reconciling this problem?
 
  • #3
Yes, that fraction is the problem.

I tried to solve it with l'Hopital's rule, but just got into a recursion, as expected...
 

1. What is the purpose of finding the limit t->0 for H'(r) and τ(r)?

The limit t->0 for H'(r) and τ(r) is used to determine the instantaneous rate of change and the slope of a curve at a specific point. This information is crucial in many areas of science, such as physics, engineering, and economics.

2. How is the limit t->0 calculated for H'(r) and τ(r)?

The limit t->0 is calculated using the standard limit definition, where t approaches 0 from both the positive and negative sides. This involves plugging in smaller and smaller values for t and observing the resulting values for H'(r) and τ(r).

3. What does H'(r) and τ(r) represent in terms of a function?

H'(r) represents the derivative of the function H(r), which is the rate of change of H(r) with respect to r. τ(r) represents the tangent line to the curve at a specific point, which is the slope of the curve at that point.

4. Why is it important to find the limit t->0 for H'(r) and τ(r)?

It is important to find the limit t->0 for H'(r) and τ(r) because it allows us to analyze and understand the behavior of a function at a specific point. This information is useful in making predictions and solving real-world problems.

5. Can the limit t->0 for H'(r) and τ(r) be used for any type of function?

Yes, the limit t->0 for H'(r) and τ(r) can be used for any type of function, as long as the function is continuous. This means that there are no breaks or gaps in the graph of the function, and the limit can be found at any point on the curve.

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