<p>I know, i'm a poser, but whatever, you know the rules --let's get this thread goin, i'll start</p>
<p>what is the formula for centripetal force?</p>
<p>Ooh! Ooh! I know this one!</p>
<p>Fc=(m*v^2)/r</p>
<p>Yeah, I know this thread isn't happening. We're all failing anyway.</p>
<p>Stuff i suck at: Electricity..</p>
<p>wire is wrapped around a bar of metal and electrcity flows from the left to the right. which way is the temporary Positive and Negative sides?</p>
<p>Ugh, is this like, right-hand rule? Because I hate that. I slept through the second semester of physics (and by slept through, I mean I did my Psych HW), so I totally don't get electricity either. At least the Physics has an inconceivably generous curve. W00t!</p>
<p>lets skip electricity... we will never understand it. next question... does magnetic field do any work? why? or why not</p>
<p>forget magnetism..whats the formula for torque?</p>
<p>i am skipping torque</p>
<p>torque= force x length</p>
<p>At the rate we're going, we should skip it all lol
How are you physics B guys studying?</p>
<p>does anyone know anything about voltmeters and ammeters?</p>
<p>Yeah what about them?</p>
<p>like what do they measure?, if given a diagram of a circuit and both of these devices connected, how do you tell which is which? etc.</p>
<p>i didn't pay attention at all that chapter</p>
<p>A voltmeter will be placed in parallel, an ammeter would be placed in series. that's the easiest way to tell.
the ammeter measures current, the voltmeter measures potential difference</p>
<p>My question for you is, following conventional current, you use right hand rule... What rule do you use for induced current?
I know you use left hand rule when current is _____ (produced/incuded) due to motion, right hand rule when _____ (produced/induced) due to electricity.
So lost... so lost.</p>
<p>wwhaaat...ive never heard of a left hand rule. are u talking about like lenz's law and how its the opposite cuz the magnetism has like "inertia" almost in that it resists changes in its magnetic fields so its gonna createa current that opposes the magnetic field? (hence do right hand rule to find out the field and then switch it)</p>
<p>things i dont understand about physics:
hte concept questions like u have two balls here and here which will happen, a- ball A will land first b - ball B will land first stuff like that
umm freakin OPTICS. O.O its so confusing.....
thermo i kno from chem...nuclear is easy......
electricity.....ahahahah.............................................someone talk about capacitors and when they might act as resistors or something (when theyre fully charged?)
also what IS the curve?</p>
<p>optics is the easiest in my opinion after thermodynamics... well the mirrors stuff is easy. but i hate the interference crap and the diffraction stuff. i am worried aobut magnetism the most.. i hate it !!!</p>
<p>let me talk all about RC circuit that i know. i might be wrong
theres a battery with some voltage. when the switch closes, after some time, the capacitor is fully charge until no current flows anymore. after its fully charged, the voltage of capacitor matches the actual voltage. also, i think if there are resistors, treat them in series when the circuits closed</p>
<p>anyone have any predictions on what free response questions might be about? i hope its not momentum. also, i noticed last year they only had 6 questions? is that going to be the norm now?</p>
<p>Optics isn't really confusing. My weakest point in physics is waves. Light waves basically, and thin films.... Never understood that..</p>
<p>Curve, someone, please. I want to make sure i can secure a 4</p>
<p>i think its like 90 maybe out of 180 points? for a 4</p>
<p>50%? I think i can wing that. Well i hope lol, i know i'm not getting a 5, but i'm hoping for a 4. Anyone care to share any study tips?</p>
<p>Princeton Review's AP Physics B/C book seems to be proving useful for me. Reading through a chapter and spending time doing the problems and really understanding the free response questions/answers I seem to be really grasping the idea/applications of it. Try that on the chapters you're not sure about. See if it works for you.</p>