- #1
Pual Black
- 91
- 1
Homework Statement
i have this problem and need your help. I tried to solve the first 2 question but don't know ho to solve the third one
Using Green's Theorem for Solving Line Integrals
- Thread starter Pual Black
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- Integral Line Line integral
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Homework Help Overview
The discussion revolves around the application of Green's Theorem to evaluate line integrals, specifically focusing on a problem involving curves defined by equations and points in a coordinate system.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants discuss the interpretation of the problem, questioning the setup and clarity of the equations provided. There are attempts to clarify the relationships between the lines and points involved, as well as the implications of the integrals being evaluated.
Discussion Status
The conversation is ongoing, with participants providing feedback on initial attempts and raising questions about the problem's wording and structure. Some guidance has been offered regarding the interpretation of the integrals and the areas they represent, but no consensus has been reached on the correct approach to the third part of the problem.
Contextual Notes
There are indications of potential miscommunication regarding the problem's details, including the definitions of the lines and points involved. Participants are also considering the implications of the area under the curves and the conditions under which the integrals may yield zero.
i have this problem and need your help. I tried to solve the first 2 question but don't know ho to solve the third one
- #2
Moriarty
- 26
- 2
The answer to your first part is wrong just fyi. Think about the area under the curve of that line. Does it look like it's zero?
As is the second part. You used the upper bound of the integral as the value you subtracted, it should be the thing you subtract from.
And I'm not sure what the third part is asking. Is it asking for the integral on the line OA and the line OB, in which case it'd be zero, or is there something you didn't write down. How is it exactly written in the problem?
As is the second part. You used the upper bound of the integral as the value you subtracted, it should be the thing you subtract from.
And I'm not sure what the third part is asking. Is it asking for the integral on the line OA and the line OB, in which case it'd be zero, or is there something you didn't write down. How is it exactly written in the problem?
Last edited:
- #3
Pual Black
- 91
- 1
Im not sure if i copied the problem right but i have another copy from my friend of the same problem
1- from OA ( straight line ) ##y=2x##
2- from OA ( arc ) ## y=2x^2 ##
3- the line OB
4- the line BA
1- from OA ( straight line ) ##y=2x##
2- from OA ( arc ) ## y=2x^2 ##
3- the line OB
4- the line BA
- #4
HallsofIvy
Science Advisor
Homework Helper
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What you have shown is difficult to read! It appears that you meant that O and A are points: O= (0, 0) and A= (1, 2). But if so, then "over the point OA" makes no sense. I think you mean "over the line OA".
If [itex]y= 2x[/itex], what is dy?
If [itex]y= 2x^2[/itex] what is dy?
I'm not clear on what "3- the line OB, 4- the line BA" is supposed to mean when initially the you had the single problem, "From OB to BA", which also makes no sense since you do not go "from" one line to another. I think that what you mean is that all these integrals are from O to A, the third problem being along the horizontal line from O to B, y= 0, and then along the vertical line from B to A, x= 1.
If y= 0, what is dy? If x= 1, what is dx?
If [itex]y= 2x[/itex], what is dy?
If [itex]y= 2x^2[/itex] what is dy?
I'm not clear on what "3- the line OB, 4- the line BA" is supposed to mean when initially the you had the single problem, "From OB to BA", which also makes no sense since you do not go "from" one line to another. I think that what you mean is that all these integrals are from O to A, the third problem being along the horizontal line from O to B, y= 0, and then along the vertical line from B to A, x= 1.
If y= 0, what is dy? If x= 1, what is dx?
- #5
Moriarty
- 26
- 2
Well if you think about it for parts 3 and 4, when you take an integral you're finding the area underneath the curve between it and the x-axis. So if there's no distance between the line and the x-axis, or it's perpendicular to the x-axis, there is no area underneath it, so it's zero.
- #6
Pual Black
- 91
- 1
Maybe i shall use greens theorem??
Will it make sense??
Will it make sense??
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