Recent content by Jiachao

I'm still in high school so is that possible to solve using my level of mathematics? After I subbed the numbers in, I did a quick sketch on graphmatica and it didn't show any intersections between y = \sqrt{1-36n^{2}} +\frac{arcsin (6n)}{n} -1 and y = 2e + 2pi so have I done...

Thanks for the replies.

Hi, I know its possible to get an answer by graphing the curves and finding the point of intersection but I was wondering if there was a way to do them algebraically. sin(2x) = \frac{x}{2} or e^{\frac{x}{8}} = x Also, do these types of equations have a name?

Hi, really quick question. Is there a relationship between the Meissner effect (in superconductors) and Lenz's law. Also, can the Meissner effect alone explain why a magnet can levitate over a superconductor, or do I need to learn about flux trapping (which isn't required by my syllabus).

Ok, I thought about it for a while and I came up with this diagram. http://img526.imageshack.us/img526/2300/18937972.png But if I was to take out the coil in the second circuit so the voltage is not step-down, that would lead to the same dilemma which I stated above. Is there something...

You shouldn't have squared the time there. Intuition would also tell you it will come back down at 4ms at that point-1

Yes, that's how I did it.

And even if I were to consider other resistors in that circuit, wouldn't that mean the total resistance in that circuit would need to be 4000 Ohms for the statements to be consistent? And if the total resistance was that, that would mean all the power would dissipate out of the circuit? Hmmm...

I thought that in electricity distribution, once the voltage is stepped up, the electricity travels through wires only before it is stepped down for domestic use. Since transformers operate through the induction of emf and hence current [which is why I drew those coils in the diagram] in another...

The voltage drop across loads connected in parallel is constant(equal to supplied voltage) whereas the voltage drop across loads connected in series is proportional to their resistance (V=IR) So, calculate the voltage drop across the 5Ohm resistor and use that in you're calculation for Power...

Thanks for the reply. Sorry, my first post was all over the place. The following image should explain what I'm confused about better. http://img245.imageshack.us/img245/2293/image0023.jpg

Edit: My question is better expressed in my next post so ignore this post. Homework Statement A power station delivers 890 kW of power at 12 kV to a factory through wires with total resistance 5.0 \Omega How much less power is wasted if the electricity is delivered at 50 kV rather than 12 kV...