Recent content by ZoroP

Thx tiny, then i get v*dv/dt + x^3 dx/dt = 0 how to integral this? is this the same with v*dv = - x^3 dx?

Homework Statement The equation of motion for a particle of mass 1 in a quartic oscillator V(x)=0.25x^4 is x''+x^3=0. Suppose that the maximum amplitude of the oscillator is Xm(max). Find an expression for the time T that it takes to go from x=0 to x=Xm(max) and show that this time is...

Thanks, so it's A = 1/5

yes, o! you mean I can just do it like A = 1/|(3i, 4)|?? Thanks!

Well, thanks a lot, but i don't think this problem is discussing about wave function, I cannot find any concept about wave function in my lecture notes. Thus, I consider that this question is only about math and calculation. Or maybe you can teach me some about the wave function or any other...

Normalisation constant~ help~~ Homework Statement An electron is in the spin state |> = A (3i, 4), so determine the normalisation constant A. Homework Equations :rolleyes: :frown: The Attempt at a Solution :cry: Well, I get confused about this questions, can anybody tell me what...

First of all, I think I posted another same one in the advanced phys of homework forum. Anyway, thanks first, so what is the "|psi>"? The question is just copied from the assignment paper, and I have no idea either...

1.Show that one gets a 50% : 50% probability for deflection up and down in a y-Stern Gerlach measurement when atoms that are preselected as +x atoms or -x atoms are used as a source. What kind of the equation is it? Do we just need to find the coefficients and square them? 2.A source produces...

I think i get the method, thanks a lot.

I need to know that how many atomic there are in the penny, so I use the mass of the penny divides the mass of an atomic. Thanks.

Thx, yay~ well, it seems u like chemistry very much! Thank you for helping my Phys~ Yeah, i agree with you that the 0.00010% is the point of the question, but i sitll don't know how to use it and what its meanning is here. Maybe it will show the question "what do you conclude?" And your...

Hi tiny or tim~ :smile: thanks very much~. But I'm sorry that I may get some misunderstanding with molecule, it is a number unit, right? Like 1 mol C atomic = 6.02×1023 C atomic? Then where does 29 come from and am I useing the right method for calculate the number (3.11*6.02*10^23/63.5)? Thank...

Homework Statement We know that, within the limits of measurement, the magnitudes of negative charge on the electron and the positive charge on the proton are equal. Suppose, however, that these magnitudes differed from each other by as little as 0.00010%. With what force would two copper...

btw, I'm a rookie here, so I clicked wrong title just now. Please help me to move this to Calculus & Beyond or just delete it? Thanks.

well, there maybe some misunderstandings here between us. Like when x approach to 0, what I know is siny = y, so I change y''+g*siny\L = 0 to y'' + g*y\L=0. And your formula is not what I used. Whatever, thanks anyway~