06/23/13

Find the general solution?
Find the general solution of u"+2u'+u=25 sin(t). r^2+2r+1=(r+1)^2 r=-1 u=A sin(t)+B cos(t) 25 sin(t)= -A sin(t)-B cos(t)+2(A cos(t)-B sin(t))+A sin(t)+B cos(t) = -A sin(t)-B cos(t)+2A... more
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06/23/13

Find the steady-state solution?
For u"+2u'+6u=15cos(3t), find the steady-state solution and identify its amplitude and phase shift. u=A cos 3t+B sin 3t 15 cos 3t= -9A cos 3t-9B sin 3t+2(-3A sin 3t+3B cos 3t)+6(A cos 3t+B sin... more
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06/22/13

Find the solution?
Find the solution of y'+2xy=x, with y(0)=-2.
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06/22/13

How do I download free textbooks to bit torrent?
I just downloaded bit torrent software but I don't know how to download free textbooks to bit torrent. I suppose you use the website www.torrentz.com to do it but where do I type the name of my... more
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06/22/13

How do I download 'bit torrent' software?
I need this software so bad right now but I don't know how to do this. It's for downloading textbooks for free. Give me the instructions step by step. Thanks.
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06/20/13

Recommend me a good textbook for Differential Equations?
Name the title of the book, author, edition, ISBN number. Also, what bookstore sells used college textbooks for this? And what math should I take after Differential Equations for physics and... more
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06/20/13

Solve the initial-value problem?
Solve the initial-value problem dy/dt=3y(t), y(0)=50. What is the domain of the solution?
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06/19/13

Solve the equation?
Solve the equation y"'(t)-2=0 by computing successive antiderivatives.
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06/19/13

Solve the differential equation?
Solve the differential equation y^(4)-5y"-36y=0. r^4-5r^2-36 (r^2-9)(r^2+4) r=3, -3, 2i, -2i y=c1*e^3x+c2*e^-3x+c3(cos(2x))+c4(sin(2x)) Is that the right answer? And can someone give me some... more
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06/18/13

Help me with Differential Equations?
Solve the differential equation y"+4y=0. r^2+4=0   r=2i, -2i Now what?
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06/17/13

How do you input this on a Ti-89 calculator?
I want to know the technique of finding the answer for the differential equation (2xy+y^3)dx+(x^2+3xy^2-2y)dy=0. I know how to solve for it by hand but I want to know the way to check my answer for... more
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06/16/13

Solve the differential equation?
Solve the differential equation (2xy+y^3)dx+(x^2+3xy^2-2y)dy=0. I got x^2*y+xy^3+yx^2+xy^3-y^2=C but that's not the answer. And is Differential Equations taught after Linear Algebra? If so, then... more
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06/15/13

Compute the circulation of the vector field?
Compute the circulation of the vector field H=<-y^3, x^3> over the boundary of the region D={x^2+y^2<=1, y>=0}.
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06/14/13

Compute the line integral?
Compute the line integral xy dx+(x-y)dy where c is the line segment from (1, 0) to (3, 1).
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06/13/13

Find the horizontal and vertical components of this force?
A child pulls a sled through the snow with a force of 50 Newtons exerted at an angle of 30 degrees above the horizontal. Find the horizontal and vertical components of this... more
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06/11/13

Where can students take the Calculus 3 test?
Where can students take the Calculus 3 test to get college credits without taking the class? If you can't get college credits that way, then can someone just take the test and let them give you the... more
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06/09/13

Find the absolute extrema?
Find the absolute extrema of f(x, y)=3x^2+2y^2-4y on the region in the xy-plane bounded by y=x^2 and y=4. df/dx=6x df/dy=4y-4 6x=0, 4y-4=0, (0, 1) g(x)=f(x,... more
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06/08/13

How many years will it take scientists to invent teleportation device?
How many years will it take scientists to invent teleportation device from now on? And how much money can the person earn by inventing this? Can someone do experiments for this in a laboratory by... more
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06/08/13

Find the volume?
Find the volume of the solid ball x^2+y^2+z^2<=1.
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06/08/13

Find dz/dx?
The equation x-z=arctan(yz) defines z implicitly as a function of x and y. Find dz/dx. 1-dz/dx=(1/(1+(yz)^2))*y*dz/dx How do I leave dz/dx by itself? Show me step by step.
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06/08/13

Find the area of the domain D which is in the first quadrant?
Find the area of the domain D which is in the first quadrant and bounded by xy=1, xy=3, y=x, y=3x.
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06/07/13

Find the unit vector?
Let f(x, y, z)=yz+xz-6. At the point x=1, y=1, z=1, find the unit vector that points in the direction for which f is increasing at the fastest rate.
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06/07/13

Use the second derivative test?
Let f(x, y)=x^2+y^2+xy-x+y. Use the second derivative test to show that x=1, y=-1 is a local mini-mum (and thus an absolute minimum it is the only critical point) of f. fxx=2 fyy=2 What to do next?
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06/06/13

Find the surface area of the boundary surface?
Find the surface area of the boundary surface dR of the solid region R consisting of all points (x, y, z) satisfying x^2+z^2<=1 and y^2+z^2<=1.
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06/06/13

Help me with my future?
Where are physics laboratories usually located? Inside the colleges? Can you write the agreement saying that once your invention succeeds using their materials then you'll give them some profits of... more
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