# Search results

1. ### 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...
2. ### 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...
3. ### 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...
4. ### 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...
5. ### 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...
6. ### 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...
7. ### 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...
8. ### 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...
9. ### 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 ().
10. ### 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...
11. ### 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...
12. ### 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.