<p>stanfordream: is it c? </p>
<p>physics08: there are questions involving lab settings.. so it would be best to know the labs</p>
<p>Isn't the answer "E?" Capacitance = rho * (Area/Length). Since the length doubles, the capacitance is halved (inverse proportion). Therefore, since Q = CV (charge = capacitance * voltage), Q is halved as well (direct proportion).</p>
<p>Does anyone have an answer?</p>
<p>As far as I know, Resistence in wire = rho * (Area/Length) and not Capacitance=rho*(Area/Length)</p>
<p>Resistance is rho * (LENGTH/Area), not area/length. Rho should be permittivity of free space, sorry.</p>
<p>important question!!! BELOW</p>
<p>How is the best way to use the Barrons book for review for tough chapters like optics and torque?</p>
<p>I was thinking of doing the following:</p>
<ol>
<li>Read theory</li>
<li>Outline?</li>
<li>Do problems, but Im not sure how to handle this if I have to do the short answer type problems..</li>
</ol>
<p>
</p>
<p>Oh yes, I think it's "C" as well. I messed up on the Q=CV part I guess..</p>
<p>And prism-- I just read the barron's book today on torque, and it seems difficult at best, if not uncomprehensible. I suggest reading your textbook (Giancoli in my case), which should be far more comprehensive and easier to understand.</p>
<p>Is Barron's a good prepbook? I own PR, what other prepbooks are good?</p>
<p>there is definitely a lab question in AP Physics exam, as far as I know!
and I really need help in waves and sounds, I have no clue at all in this chapter, can somebody help???????????!!!!!!!!!!!!
Tks</p>
<p>I think the answer is E</p>
<p>C= eA/d ... (e being dielictric constant)</p>
<p>on halvin d, C becomes double.</p>
<p>now, C= Q/V... now V is a constant.
So Q doubles.</p>
<p>It is e). Period.</p>
<p>...(drumroll...maybe not) and the correct answer is e</p>
<p>One week until Physics test; let's resurrect this thread :D</p>
<p>Ahhhh!! I'm scared. I made this schedule that I SWORE I would follow (for AP Physics Review). It was basically a guide to reviewing w/ my books etc.. but I haven't been following it b/c of my other APs!! Does anyone else have 5 Steps to a 5 or PR? My class has prepared pretty well, but still if I don't get in some review, I can't see myself getting a 5. I'm sure I'll get AT LEAST a 3, and a 4 is entirely possible (depending on how well I review). Does anyone have any last-minute suggestions for how to review w/ those books, or in general?</p>
<p>I have the Barrons book which I think is pretty good. You go through the chapters and take little quizzes at the end then answers like 10 questions on each specific topic. This way you get good at specifics and put it all together on the practice tests. </p>
<p>Here's a question for you all.</p>
<p>A square wire frame is pulled to the right with a velocity of 4 meters per second across an inward magnetic field of 10 teslas. the length of each side of the frame is .2 meter ( Asquare = .2^2)</p>
<ol>
<li>What is the magnitudeof induced motional electromotive force in the wire?</li>
</ol>
<p>A. 40 V
B. 20 V
C. 8 V
D. 16 V
E. 2 V</p>
<p>Is the answer: C) 8V ?</p>
<p>Free response practice:
1. A cylinder of mass .2 kg and radius .1m has a string attached. A force of 3 N is applied until 3 meters of string is unwound.
a)How many turns/sec is the cylinder revolving?
b)What is the angular acceleration of the cylinder?</p>
<ol>
<li>Same problem as above, but there is now a .1 kg mass attached to the string. The block falls, pulling on the string, and the cylinder begins to rotate.<br>
a)Find the linear speed with which the block falls.</li>
</ol>
<p>Yup the answer is C indeed. emf = Blv (10)(.2)(4)</p>
<p>Does anyone know approxiamately what the curve is to get a 3? 4? 5?</p>
<p>lol... I used the magnetic flux equation ( Ba/t) = Bav/d = 8V ... I suppose I was lucky..</p>