# Search results

1. ### The system

I have to gain a real deep understanding of everything I'm learning in university and luckily for me I don't have to work to survive so I can put all day every day into learning which is what I like to do because I love learning about scientific fields. How do other people that aren't as...
2. ### Single and double slit diffraction formulae

Is the formula for single slit diffraction Dsin\theta = m\lambda identical to the double slit diffraction besides m being minima rather than maxima? More specifically will m + 1/2 tell me the angles between maxima?
3. ### Difference between work and heat in thermodynamics

Thanks a lot. That squeezing the balloon example cleared up the confusion I had about all this. In college we learned that work is "force over a distance". This made no sense to me but thinking of it as the force you have to work against to move a mass a distance it makes sense to me. I'm...
4. ### Difference between work and heat in thermodynamics

In the equation \Delta U = \Delta Q + \Delta W I'm trying to conceptualize what this means but I don't really know what's meant by heat and work. Would thinking of it as the change in heat results from the work done to or by the system while the work could be anything from beaming x-rays through...
5. ### Styles of learning

Dead true. I've been learning magnetism lately and since its hard to visualize I find it pretty hard but using the equations to solve problems I started gaining a mathematical understanding too which reinforced the hazy understanding I had of the concepts. Practicing also seems to permanently...
6. ### Styles of learning

I have a passion for pretty much all scientific subjects and I gladly spend all day accumulating knowledge relating to it but I still find the exams in university pretty hard. I wonder how people that don't have a passion for these subjects manage to pass tests. I can't just go to lectures and...
7. ### Lorentz forces

I'm having a bit of trouble understanding what exactly the lorentz force is. In this diagram here [PLAIN]http://img7.imageshack.us/img7/7065/helicinbfld.jpg [Broken] I know its the force that's keeping the proton in that helicoidal trajectory so I can see its perpendicular to the direction of...
8. ### Charged particle flying into an electric field

If a proton flies into a magnetic field I've seen the trajectory but I'm not sure about the directions of all the forces involved. In this picture [PLAIN]http://img7.imageshack.us/img7/7065/helicinbfld.jpg [Broken] I drew in a red, blue and yellow arrow. I assume the proton is moving in the...
9. ### Flux and gauss law

Thanks for the analogy that cleared up a lot of the confusion I had about \phi = \frac{q}{\epsilon_0}. As long as the thing is enclosed the amount of flux lines hitting the total surface area will be equal but the bigger the balloon the smaller the flux will be for small segments of the balloons...
10. ### Flux and gauss law

Also I'm having serious trouble understanding the difference between electric field magnitude and electric flux. Both are defined by the density of field lines per area aren't they?
11. ### Flux and gauss law

mooglue: So this surface function for the surface would take into account the angle between the field lines and the normal of the surface through the whole surface? This is the first physics application of integration I've run into so far. :smile: Is Gauss's law then just the fact that the...
12. ### Flux and gauss law

I know that electric flux is defined as the number of electric field lines passing through an area but what kinda area are we talking about. Does it have to be perpendicular to the field lines like this or could it be at an angle like this does it have to be a flat area on 1 plane like the...
13. ### Chemistry - Equilibria questions involving ICE tables

In my book for all these equilibria questions involving ice tables when I end up with Ka = \frac{(x)(x)}{initial amount - x} they always say that if the Ka is tiny compared to the initial amounts then we can assume x will be too and we can omit as many x's as we like from this equation. This...
14. ### Finding net forces when 3 charged objects are involved

I'm having trouble understanding these kinda questions. I'm assuming this kinda thing applies to all types of force when there's 3 objects exerting the force so its fairly important to know. Let's say I have 3 charges of 11x10-6C that make up an equilateral triangle...
15. ### Calculating resistance from voltage drop

On a test in college I was asked to find the current flowing through a resistor and lightbulb on a simple circuit with a battery, resistor and lightbulb. I was told the resistance of the resistor and was given a voltmeter so I measured the voltage across each of the components but when it came...
16. ### Direction of electric field lines

I have an intuitive understanding of electric fields but when it comes to defining it on a test I wouldn't know what to say. Is the electric field defined as the force produced by a charged object on a positive test charge or any other charged object? Also if you were told to draw the electric...
17. ### Courses Do chemistry courses pick up radically after the first year?

Thanks for the info. I didn't think of it like that but that's a good point in research like this I'd be better off having a specialty so my part will be the chemistry/pharmacology end or whatever I specialize in. Yep the idea of utilizing nanotechnology in neuroscience did cross my mind I have...
18. ### Courses Do chemistry courses pick up radically after the first year?

Thanks. I'm at the end of my first year chemistry course right now and from what I can see I'm done with calculus next year we cover statistics and that's it for maths. In electronics engineering they have a completely different maths class. I suppose I might as well just finish this chemistry...
19. ### Courses Do chemistry courses pick up radically after the first year?

I've heard from a few people that chemistry courses get quite hard when the 2nd year starts. I would have thought since you start to specialize in chemistry there will be a lot of overlap between classes which would make things a bit easier. I was thinking about trying to double major so I can...
20. ### Quick exponential formula integration problem

Homework Statement ex / (1 + ex)
21. ### Solubility of a solid equilibria

That explains everything. Thanks! This forum should really have a thanks button + reputation system so people can at least give reputation in return for help.
22. ### Solubility of a solid equilibria

I'm having some trouble understanding heterogenous equilibria. I read that solids, pure liquids and solvents are omitted from the equilibrium expression. Let's say I have some AgCl in a litre of water. The tiny amount of AgCl that dissociates and dissolved is given by its Ksp. I understand that...
23. ### Buffer solutions

Haha sorry I meant 0.64 moles. As in the 4:1 ratio would mean 0.8 moles of HA dissociates into 0.64 moles of HA and 0.16 moles of its conjugate base. I find the henderson-hasselbach equation very hard to visualize. The log of the fraction part throws me off. If I was to graph a weak acid...
24. ### Buffer solutions

First off how exactly do weak acid strong base reactions work. Let's say I have 1 mole of a weak acid HA in a litre of water and let's say for every 4 undissociated molecules 1 molecules dissociate. So I have about 0.2 moles of H+ ions in this solution then I add some KOH let's say 0.5 moles. I...
25. ### Can someone validate my practice exam answers

I have a good few past exam papers to practice but they don't come with solutions so I don't know if I'm answering them correctly or not. If anyone has the time can you tell me if I'm on the right path or not with these physics questions. Note: To keep it short I'll write the scientific...