Recent content by tunabeast

After asking my tutor i now know how to work this out.

[SOLVED] Physical chemistry problem Homework Statement A closed vessel of 5L volume is kept at 80 degrees celcius and contains a mixture of two liquids A and B dissolved in a solvent, with their initial concentrations [A]=0.1mol/L and [B]=1.0mol/L. The volume of the gas phase is 2L and it...

Thanks very much for the information. I completely understand about the download link, and i'v now attached a PDF file of the presentation. I think the answer to part a may well be on the second page. However unfortunately I'm still at a dead end on (b). Would it require plotting a graph? If so...

Homework Statement Hi, having not studied biology I'm struggling to get to grasps with what are probably basic concepts. Looking through the notes i have i was just wondering if the equations/derivations i'v attached are relevant, and if so how. A link to the powerpoint file can be found...

Sorry about that, stupid error. In the initial problem it should be \frac{2sqrt(y)}{x^2}

Homework Statement x^2\frac{dy}{dx}=\frac{2sqrt(y)}{x^4} Where y(1)=3 Homework Equations The Attempt at a Solution \int \frac{dy}{2sqrt(y)}=\int \frac{dx}{x^4} 4sqrt(y)=\frac{-1}{3x^3}+c c=4sqrt(3)+\frac{1}{3} So i end up with...

Homework Statement \ \frac{dy}{dx} + 2y = xe^x Homework Equations The Attempt at a Solution I'v only ever solved differential equations where values can be separated easily, i understand i may have to use something called the integrating factor but this does not seem to fit...

fikus what do you mean, i can do a substitution straight away?

Homework Statement Compute the following antiderivative \int (sin^3(x))(cos^4(x)) dx Homework Equations The Attempt at a Solution If this problem requires use of integration by parts I'm struggling to work out to split it up and make it manageable. Have searched countlessly for...

Homework Statement Compute the following antiderivative \int \frac {(2x+1)}{ (x^2+1)} d \ xHomework Equations The Attempt at a Solution I tried a method using using substitution of u = x^2+1, but i think this is approaching the question in the complete wrong way. I think maybe some kind of...

Homework Statement In a closed system shown in the Figure below (http://i18.tinypic.com/7x1r8mo.jpg"), the piston is freely moving without friction and the system is initially filled with gaseous molecules A only. The mass of a piston is 100 g, its area is 10 cm2 and it is 10 cm from the...

It tends to 1? I think i understand this now, thanks very much for your help.

Homework Statement Obtain the derivative of e^{2x} from first principles. Homework Equations The Attempt at a Solution I am upto the point where i have e^{2x}(\frac{e^{2h}-1}{h}) Where LIM h->0. I just don't see how 2 is obtained from what's in the ().

Thanks for your help :)

Just reading over the question i realize i made a mistake, the interval is in fact [-2, 1]. Do i need to substitute all of the numbers in the interval to the equation, ie. -2,-1,0,1?