Integrating DW/RDR: A Step-by-Step Guide

[harpreet singh]

Plz explain me how can i integrate dw/rdr

 

[harpreet singh]

please help me with this..

 

[Hootenanny]

Plz explain me how can i integrate dw/rdr

Could you perhaps explain you question further?

 

[harpreet singh]

w is a function of r and i need to integrate dw/rdr with respect to r

 

[rock.freak667]

w is a function of r and i need to integrate dw/rdr with respect to r

you mean you want to find

$$\int \frac{1}{r} \frac{dw}{dr} dr$$


?

 

[harpreet singh]

Ya exactly..

 

[harpreet singh]

I was trying it by using by parts.. By taking 1/r as the first function. But with that i m getting the answer zero..

 

[rock.freak667]

I was trying it by using by parts.. By taking 1/r as the first function. But with that i m getting the answer zero..

Do you happen to know what dw/dr is ?

 

[harpreet singh]

w is a function of r here.. So it can be written as dw(r)/dr

 

[nicksauce]

I'm sorry but this just seems silly. It's like asking, how do I do the integral $$\int{f(x)dx}$$. The answer to this question will clearly depend on what f(x) is. Here, the answer to your question will depend on what kind of function w(r) is. So unless you give us more information, I don't think we can help you.

 

[harpreet singh]

Actually I am calculating the value of w(r) from a differential equation.. And in satisfying the boundary conditions I need to know that integral to calculate the valuues of constants. As of now w(r) is unknown.

 

[Defennder]

Then I suggest you post the question. We won't know how to help if we don't know exactly what the question is asking for.

 

[HallsofIvy]

Going back to the original question, which I suspect is NOT the question you are really asking,

[tex]\int (dw/dr)dr= w(r)+ C[tex]
where C is an arbitrary constant, by the fundamental theorem of calculus.