Recent content by dcl

1. Ultra high energy cosmic particles?

http://www.fourmilab.ch/documents/ohmygodpart.html Has some infomation of such high energy particels. It also briefly states how it was detected.
2. Stargazing New Scientist Article - Pendulums + Solar Eclipse

I'd love to see more infomation on this if anyone has any.
3. Projecting a vector onto a plane problem

Thanks for that, guess it was simpler than I thought. :)
4. Projecting a vector onto a plane problem

Heya's how would one go about spanning a vector say 'u' onto a plane spanned by vectors v1 and v2. I have a formula for projecting a vector onto say a subspace w: projw(u) = <u,v1>v1 + <u,v2>v2 + .... <u,vn>vn But I'm unsure how to use this for when I need to project the vector onto a...
5. Simple Gas mass/volume Question

Yer probably... Might be a type in the question.
6. Acid concentration Q's

Heya's Having some problems with the following question: Trimethylacetic acid C_4 H_{11} COOHis a weak monoprotic acid. When 0.0010 mol of Trimethylacetic acid was dissolved in 100mL of water, the concentration of trimethylacetic ion was found to be 3.0 \times 10^{ - 4} mol.L^{ - 1} a)...
7. Calculating Heat Of Combustion

OK, think I may have worked it out.. I got an answer of around 2747 kJ/mol, whereas my book gives the answer of 2740 kJ/mol.
8. Calculating Heat Of Combustion

Hey, I need some help with the following question: A sample of 0.1964g of Quinone (C6 H4 02, Relative Molar Mass = 108.1) was burned in a bomb calorimeter that heas a heat capacity of 1.56 kJ/M. The temperature in the caolorimeter rose from 19.3 to 22.5 degrees celcius. (a) write a...
9. Simple Gas mass/volume Question

The exhaust gas from a car is tested and found to contain 8% by volume of carbon monoxide. If the molar volume of CO at SLC = 24.4 L/mol, what is the mass of carbon monoxide in 1L of exhaust gas? I'm very new to these calculations and am unsure how to approach it.

I see, makes sense. Thanks for clearing that up.

Heya's Im a bit confused reguarding gravitational potential energy. I've seen 2 different calculations U(h) = mgh where h is the height above the ground. and U = -GMm/r (off the top of my head, havnt got my notes here with me right now) Could anyone help clear this up for me? Why...
12. Complex Integral

Stuffed up in the first step :( Thanks guys. :) prolly should goto bed now. :(
13. Complex Integral

Here is the problem: {\mathop{\rm Im}\nolimits} \int {e^{x(2 + 3i)} } dx One sec, I'm having another go at it. = {\mathop{\rm Im}\nolimits} \int {e^2 } e^{3ix} dx = {\mathop{\rm Im}\nolimits} \int {e^2 } [\cos (3x) + i\sin (3x)]dx \begin{array}{l} = \frac{{ - e^2 \cos...
14. Tangent Plane And Normal Vector.

Think I've worked it out for myself. Method was sorta wrong. Once I have Grad F, all I need to do is sub in the values of the point and It will give me the normal vector and from that I can work out the equation. I think thats right.
15. Tangent Plane And Normal Vector.

I'm having trouble working out the tangent plane of an equation at a specified point (4,1,-2) The equation being 9x^2 - 4y^2 - 25z^2 = 40 now \nabla f = (18x, -8y, -50z) yeh? Just reading off this should give us the normal vector shouldn't it? (18,-8,-50) and from that we can work out...