(x cos(y) + x2 +y ) dx = - (x + y2 - (x2)/2 sin y ) dy
I integrated both sides
1/2x2cos(y) + 1/3 x3+xy = -xy - 1/3y3+x2cos(y)
Then
I get x3 + 6xy + y3 = 0
Am I doing the calculations correctly?
Do I need to solve it in another way?
I will be taking intermediate mechanics next semester, and am a bit concerned about potential gaps in my mathematical knowledge. Long story short, I used to be a physics major, switched to electrical engineering, and then decided to double major after a semester in EE. The issue is that, as a...
Namely, in the system, I have obtained the value of parameters L, M, A and D, because I treat the other organism as equal to zero, i.e., it doesn't exist, but I am struggling about the values of B and C, that are coupled with the product of x and y. Can anyone help me how to obtain those values...
One thing that is given in paper (attached) is a operating set point for temperature which is given as 20 for day and 16 for night but I do not know whether its initial condition for temperature or not. Can anyone please guide me that what kind of equation is it and how can I solve it with these...
I was dealing with nonlinear systems of differential equations like the Lorenz equations (https://en.wikipedia.org/wiki/Lorenz_system). Now there is a trapping region of this system defined by the ellipsoid ρx^2+σy^2+σ(z-2ρ)^2<R.
I wondered how this region is found and I found out that a...
Hi,
I am an undergrad looking to purchase a good textbook on differentials for my course which I will be taking soon, and the textbook listed for the differentials course is this one (https://www.amazon.com/gp/product/1118531779/?tag=pfamazon01-20) which apparently is not very good. So can...
Ben Sparks uses https://www.GeoGebra.org to explain (and code) the so-called SIR Model being used to predict the spread of cornavirus (COVID-19). A pretty cool way to visualize a set of differential equations.
From integration by parts, and using y(10) = 0, I get the equation ##2e^{3t-30} = \frac{|y-2|}{|y+1|}.##
Let ##f(t) = 2e^{3t-30}##.
Since it's for t>10, f(10) = 2, and we have ##2=\frac{|y-2|}{|y+1|}##. Depending on the sign I choose to use, I get either that y=-4 or y =0. Since ##t: 10...
I know how to solve ODEs using both methods. The problem I'm having is knowing when to use one and not the other. If someone could help clarify this for me. I can't find the correct section in my textbook.
So this is what I have done:
##f'(t)=k*f(t)*(A-f(t))*(1-sin(\frac{pi*x}{12}))##
##\frac{1}{f(t)*(A-f(t))}=k*(1-sin(\frac{pi*x}{12}))##
I see that the left can be written as this (using partial fractions):
##1/A(\frac{1}{f(t)}-\frac{1}{A-f(t)})## And then I take the integral on both sides and...
Summary: Mechanics problem related with Calculus (differential equations)
Hi everyone, I would like some help in that task, if anyone would be willing to help :) Namely I have a problem from particle dynamics. "D:" means given info... so, D: m,g,h,b, miu. We're looking for v0 and S as given...
.
Above is the figure of the problem.
I am trying to solve x(t) and differentiate it to obtain v(t); however, I have difficulty solving the differential equation shown below.
$$ v(t)=\int a(t)dt=\int \frac{B(\varepsilon-Blv)d}{Rm}dt \Rightarrow \frac{dx}{dt}=\frac{B\varepsilon...
Homework Statement
Homework Equations
euler
##e^{ix} = cos(x) + i*sin(x)##
##e^{-ix} = cos(x) - i*sin(x)##
The Attempt at a Solution
I'm starting with differential equations and I'm trying to understand this solution including complex numbers:
First we determine the zeros. I understand that...
Homework Statement
Homework Equations
$$F = \nabla \phi$$
The Attempt at a Solution
Let's focus on determining why this vector field is conservative. The answer is the following:
[/B]
I get everything till it starts playing with the constant of integration once the straightforward...
Homework Statement
x(dy/dx) = 3y +x4cos(x), y(2pi)=0
Homework Equations
N/A
The Attempt at a Solution
I've tried a couple different ways to make this separable, but you always carry over a 1/dx or 1/dy term and I can never fully separate this. I've also tried to do a Bernoulli differential...
I am trying to determine an outer boundary condition for the following PDE at ##r=r_m##: $$ \frac{\sigma_I}{r} \frac{\partial}{\partial r} \left(r \frac{\partial z(r,t)}{\partial r} \right)=\rho_D gz(r,t)-p(r,t)-4 \mu_T \frac{\partial^2z(r,t)}{\partial r^2} \frac{\partial z(r,t)}{\partial t} $$...
Hey all,
I hope this is the correct forum section to post this in.
I heard about this problem from a youtube video but I've not been able to simulate it because the video was meant only for an introduction into PID control.
Here's the problem:
A remote control helicopter is hovering just...
Homework Statement
Find Orthogonal Trajectories of ##\frac{x^2}{a}-\frac{y^2}{a-1}=1##
Hint
Substitute a new independent variable w
##x^2=w##
and an new dependent variable z
##y^2=z##
Homework Equations
The Attempt at a Solution
substituting ##x## and ##y## I get...
Homework Statement
[/B]
Homework Equations
[/B]
The Attempt at a Solution
[/B]
Could you tell me is there something specific that I need to the with sin(xy)? Thanks
Hi!
When we want to look at different singular points for e.g Bessel's eq. $$u´´(x) + \frac{u'(x)}{x} + (1- \frac{n^2}{x^2})u(x)$$.
We usually evaluate the equation letting x= 1/z. But I don't algebraically see how such a substitution ends up with $$w´´(z) +( \frac{2}{z}-...
Hey all,
I don't understand what makes a differential equation (DE) linear.
I found this: "x y' = 1 is non-linear because y' is not multiplied by a constant"
but then also this: "x' + (t^2)x = 0 is linear in x".
t^2 also isn't a constant.
So why is this equation linear?
COPYRIGHT strictly reserved to A. K. Nandakumaran, P. S. Datti & Raju K. George, Department of Mathematics, IISc Bangalore. Duplication PROHIBITED.
Lectures: http://www.nptel.ac.in/courses/111108081/
Syllabus: http://www.nptel.ac.in/syllabus/syllabus.php?subjectId=111108081
COPYRIGHT strictly reserved to A. K. Nandakumaran, P. S. Datti & Raju K. George, Department of Mathematics, IISc Bangalore. Duplication PROHIBITED.
Lectures: http://www.nptel.ac.in/courses/111108081/
Syllabus: http://www.nptel.ac.in/syllabus/syllabus.php?subjectId=111108081
COPYRIGHT strictly reserved to A. K. Nandakumaran, P. S. Datti & Raju K. George, Department of Mathematics, IISc Bangalore. Duplication PROHIBITED.
Lectures: http://www.nptel.ac.in/courses/111108081/
Syllabus: http://www.nptel.ac.in/syllabus/syllabus.php?subjectId=111108081
COPYRIGHT strictly reserved to A. K. Nandakumaran, P. S. Datti & Raju K. George, Department of Mathematics, IISc Bangalore. Duplication PROHIBITED.
Lectures: http://www.nptel.ac.in/courses/111108081/
Syllabus: http://www.nptel.ac.in/syllabus/syllabus.php?subjectId=111108081
COPYRIGHT strictly reserved to A. K. Nandakumaran, P. S. Datti & Raju K. George, Department of Mathematics, IISc Bangalore. Duplication PROHIBITED.
Lectures: http://www.nptel.ac.in/courses/111108081/
Syllabus: http://www.nptel.ac.in/syllabus/syllabus.php?subjectId=111108081
COPYRIGHT strictly reserved to A. K. Nandakumaran, P. S. Datti & Raju K. George, Department of Mathematics, IISc Bangalore. Duplication PROHIBITED.
Lectures: http://www.nptel.ac.in/courses/111108081/
Syllabus: http://www.nptel.ac.in/syllabus/syllabus.php?subjectId=111108081
COPYRIGHT strictly reserved to A. K. Nandakumaran, P. S. Datti & Raju K. George, Department of Mathematics, IISc Bangalore. Duplication PROHIBITED.
Lectures: http://www.nptel.ac.in/courses/111108081/
Syllabus: http://www.nptel.ac.in/syllabus/syllabus.php?subjectId=111108081