<p>oo duh..no wonder I got confused...usually on kaplan and real test they give constants</p>
<p>wait but where is the value for mass? and how are you supposed to figure this without a calculator?</p>
<p>Hey dudes,</p>
<p>I'm going through Princeton and I'm finding the chapter on Electric Potential and Capacitance very difficult. Is it worth it to learn this stuff? None of this was ever mention in my physics classes or Kaplan.</p>
<p>I did it in class, and I thought it's part of every physics I class?</p>
<p>well kaplan says there will be 1 question max on it, and princeton does a whole confusing chapter. it won't show up on the test in that much detail at least</p>
<p>How many questions wrong for an 800?</p>
<p>Checkmate,from that chapter know at least combinations of capacitors.That's important!</p>
<p>I also thought that chapter is pretty confusing in the PR book, but then again, I'm stuggling to understand it, just in case :)</p>
<p>there is something I can't understand.
an object with constant mass rests on a horizontal surface whose coefficient of frction is 0.2 . if a horizontal force F is applied to the object, what will be the effect(s) on the object?
I. it may move with constant speed in the direction of F once it has been set in motion.
II. it may remain at rest.
III. it may accelerate
IV. it may move with constant speed in a direction opposite to F.</p>
<p>A. I,II and III only
B. I and II only
C. II and IV only
D. IV only
E. none of the above</p>
<p>so, II and III are obviously true. but the answer in the book says I is also true. why is that? their explanation: "once set in motion, the object will move with constant speed if F equals the force of friction. A slightly larger force is needed to start the motion because starting friction is greater than sliding friction."
so if F is greater than the force of friction till the object starts moving how can it equal the force of sliding friction(that is smaller) after the object has been set in motion(so that there could be a constant speed)???? should I have implied from the question that F can change its value? why?</p>
<p>bump.....
anyone? :D</p>
<p>once an object is set in motion, and then the force is made equal to the force of friction, then there is no net acceleration, and the object is already moving. so it will have a constant velocity. that's my reading anyway. i'm also giving it on the 8th.</p>
<p>I am wondering if the REAL SAT II scoring chart for SAT II physics is accurate?</p>
<p>but that was my question, should I have inferred that F can change once the object is put into motion?</p>
<p>Once the object overcomes the static force, then the object will have constant velocity if the force equals the kinetic friction force.</p>
<p>Hey, did you guys find the REAL SAT II physics test REALLY EASY? much easier than PR?</p>
<p>Do you think the test this saturday will be that EASY? Anyone who has already taken the REAL SAT II TEST in the book and the actual one, please comment.</p>
<p>thanks</p>
<p>yeah please someone who has taken it please comment. I'm wondering the same thing...I felt the test in REAL SAT IIs was too easy compared to all the stuff I did in kaplan and princeton.</p>
<p>One thing that I guess may be usefull is the semi-practice test online at collegeboard for the different subject tests. Do the questions on that test and make sure you know em all.</p>
<p>Please Comment!!!</p>
<p>Do we need to know that equation for fringes, the weird one that's like x/d=(lamda)/something</p>
<p>oh and thanks elisa for the tip</p>
<p>fringes?</p>
<p>nope...the only thing that involves lamba (that we need to know) would be the wavelength and frequency thing and how momentum is inverse to wavelength</p>
<p>is lenz's law, capicatators, or let me see.. time dilation, mass on the exam?</p>
<p>What about mad complex problems.. i.e. pulley and inclined plane problems with sin and cos? Also</p>
<p>Huge Question GUYS!!! This question is HUGGGGGGE: When people describe current and charge... does it flow from positive to negative or vice versa? I mean when you think about charges in magnetic field..if its positive you use rt hand rule and if it is negative, you use left hand rule... Will the problem say conventional current (pos-negative) so you can assume that its the right hand rule at all times?</p>
<p>2nd huge question: Can someone tell me what happens when you insert a bar magnet (south part first) into a coil of wire, what direction current occurs and when you push it all the way through until north passes and the magnet leaves, what happens?</p>
<p>Thanks.</p>