Recent content by tigigi

I have this question that initially a metal ball of radius r1 with potential v1, then surrounded by a conducting shell with radius r2. Find potential of ball if shell grounded. So v1 =kq/r1, then q=vr1/k, can I say directly that shell will have -q since it's induced by ball? Then v ball will be...

Hi, I wonder if anyone can suggest any books, articles, etc. for people just start to / want to have an understanding about what Quantum information is about. Also, can anyone suggests any related courses I can take in physics or other fields that would be helpful for getting into this field...

Hi, I'm going to study this myself. I wonder if anyone can suggest me a book covering both thermal and statistical physics book, undergrad level. Thanks.

Thanks for these answers. I take a look at the question and figure you can find total energy loss from the data, graph, and from there find friction, which cause the energy loss. The initial pull (more conceptual) means overcomeing static friction, so the energy loss is due to only kinetic friction.

Thanks. I'll see the manual again on Monday, and I'll post the exact complete situation and question from it. It seems to be something simpler, no need to know the exact force pulling it.

The situation was, two objects with same mass release at the same height without initial velocity. But now it gives the object a little pull ( I guess it means it gives it some initial velocity) then how can you find / decide friction force from this situation.

Thanks. And if there's initial pull to give a bit speed in the beginning, how to know the friction from this experiment?

I'm actually grading this stuff, and have a question. Ideally there's no friction and no kinetic energy of pulley. If we take them into account, which one is more important? I wonder how to analyze this? Thanks a lot.

I wonder if anyone can suggest any short reading about basic understanding of L space or L2 space (not wikipedia) I know nothing about it, googled around, but doesn't seem to find things helping me solve some problems. First, there's this question: For what range of μ is |x|^μ in L2(-1,1) I...

I think I almost get there, but something's not right, and need your help. if F(ψa,ψb) is a complex valued (scalar) functional of the two variable vectors ψa and ψb with linearity properties. Show that F can be represented as an inner product F(ψa,ψb)=(ψa, Aψb), for every ψa,ψb and the previous...

Thank you micromass. Your opinion enlightens me, and it gives me a direction to think about my sop. I'll try to write something and see how it goes. Thank you.

Thank you Ben. I'm not in the states. I went back home, which is not in the states, after being dismissed. I'm not a vet either. I had major depression for a long time and I was raped. PTSD, eating disorder, etc, all followed, and it was tough. I don't want to reveal my personal stories. But...

Hi everyone, I'd like to have some advice on my sop for applying physics graduate school. I used to attend a physics PhD program, but I was dismissed b/c of low GPA. It happened at the end of 2010. I worked out my problems and am ready to go back to school and finish my degree. I'm planning...

I checked the datasheet for TL074 that : supply volt V : +-18 V input volt Vin : +-15 V differential input volt Vid : +-30 V power dissipation Ptot : 680 mW output short-circuit duration : infinite

Thank you, but I don't really understand. The supply has one +, one -, one ground. Do you mean connecting 1 resistor to ground and +, the other to ground and - ? and connect 2 capacitors, 1 to ground and +, and the other to ground and - ? Thanks again !