# Search results

1. ### Physical chemistry problem

After asking my tutor i now know how to work this out.
2. ### Physical chemistry problem

[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...
3. ### Metabolic pathways problems

Homework Statement The questions i'v been given are 1. With the aid of a diagram, describe the mechanism of CUMULATIVE feedback regulation in branched metabolic pathways. (5 marks) 2. Explain how the use of iso-enzymes allows cells to regulate metabolic pathways using feedback...
4. ### Enzyme kinetics question

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...
5. ### Enzyme kinetics question

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...
6. ### Differential equation problem

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

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...
8. ### Linear differential equation problem

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 seperated easily, i understand i may have to use something called the integrating factor but this does not seem to fit...
9. ### Integration problem

fikus what do you mean, i can do a substitution straight away?
10. ### Integration problem

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...
11. ### Integration problem

Homework Statement Compute the following antiderivative \int \frac {(2x+1)}{ (x^2+1)} d \ x Homework 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...
12. ### Physical chemistry problem

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...
13. ### First principles differentiation question

It tends to 1? I think i understand this now, thanks very much for your help.
14. ### First principles differentiation question

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 ().

16. ### Maximum and minimum problem

Just reading over the question i realise 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?
17. ### Maximum and minimum problem

[SOLVED] Maximum and minimum problem Homework Statement Determine the global maximum and global minimum of the following func- tions on the given interval, or indicate why these do not exist. f(x) = x^{2}e^{x} on [2, 1]. Homework Equations The Attempt at a Solution I do not...
18. ### Integration problem

no problem, thank you very much for your assistance :)
19. ### Integration problem

The 6 is just the value of the limits substituted in to get a final answer, or is not that what the substituted value would be?
20. ### Integration problem

Ignore that last post, is \frac{4}{3}tan^{-1}(6) correct?
21. ### Integration problem

Hmm i can't seem to get it, when i integrate i get \frac{1}{12}tan^{-1}(12)
22. ### Integration problem

I ended up with 4arctan(6) Am i close?
23. ### Integration problem

I have just looked up the definition, can't quite see how it will fit
24. ### Integration problem

Homework Statement Determine \int4dy/(1+9y^{2}) With limits of 2,0. Homework Equations The Attempt at a Solution Have attempted ingtegration by substitution but have had no luck solving this problem. A maths tutor who went over it very quickly established there was a tan in the...
25. ### Tricky trig derrivation

I'm not actually sure i can, this is the first time i'v come accross this kind of differentiation question i'm afraid
26. ### Tricky trig derrivation

Homework Statement Calculate the derivative of tan^{2}(sin(2x+1)^{6}) Homework Equations The Attempt at a Solution I assume this uses chain rule, by do not see how tan^{2} can be derrived.