Recent content by johnathon

According to Wikipedia, vapour pressure is the pressure of a vapor in thermodynamic equilibrium with its condensed phases in a closed system. Does that mean the pressure the vapour exerts on the container or the pressure the vapour exerts on the liquid?

Where does the 3/2 come from? \frac{1}{2} mv^2 = \frac{3}{2} kT

What I was asking is if there're three branches, why isn't the voltage across each branch equal to 1/3 of the supplied voltage?

Why is it that in a series circuit the sum of the voltages across the components is equal to the voltage supplied by the battery but in parallel the voltages are equal for different branches in the circuit?

Yep. I've been extremely determined over the past month and have gotten through all that. Luckily I can pick up new concepts very quickly. Each course in the open courseware is about 25 lectures at one hour each, so they're pretty in depth (hope I'm not giving the impression that I rushed...

I'd say my physics background is pretty decent. I got through 3 courses from the MIT open courseware (classical mechanics, electricity and magnetism, vibrations and waves). Would that be enough to go on?

How much quantum mechanics was in your not so strong physics background? Does the Dirac book assume preknowledge of quantum mechanics?

So can ohm's law be derived from the nearly free electron model?

How advanced is this text? The only exposition I've had to quantum mechanics is through "The Quantum Universe" by Brian Cox and Jeff Forshaw. That book was a nice introduction but now I'm looking for something a lot more in depth. Would someone with a strong mathematical background but only a...

I'm watching MIT 8.02 electricity and magnetism () and the lecturer says that there is a derivation of ohm's law but it uses quantum mechanics which is outside the scope of the course. Does anybody know of this derivation and can point me to it? I searched around but can't find anything

Ah, brilliant. Thanks

So is the tension the equal and opposite reaction to my pulling?

So if I lift up the string with a force of 2N, the tension also increases by 2N (applying Newton's 3rd law)?

If I attach an object to the end of a string and hold it still I get that the tension will be equal to the weight of the object. But what if I start to move the string up. How does that affect the tension?

Why wouldn't you feel gravity? There's still a force acting on you