official AP Physics B 2011-2012 thread!

<p>after the test for some reason i couldn’t stop thinking about most of the FR, and then i realized how many dumb mistakes i made…ugh i’m angry</p>

<p>yea i had no clue how to do the one with the uranium and the proton i left it blank.
and the FRQ where you had to write an experimental procedure was dumb i saved it for last then BS’ed it at the last second</p>

<p>@ImErulisse and physicks: </p>

<p>SAME HERE! If it makes you feel any better, I completely messed up the second part of the first FRQ… yeah, the most basic question ever pertaining to the tension in a string. ASJFLKASDJFL;KSDJF I’m kicking myself for that. I’m praying for a 5.</p>

<p>@UrAverageAzn: Ah, derp, I forgot about that question. Maybe because it was the easiest FRQ for me.</p>

<p>if someone would show work and solve the fr after they are posted that would be sweeet.</p>

<p>I thought I did relatively well on the 2012 AP Physics B Exam. The multiple choice definitely seemed more difficult than the free response. I am praying for a five as well.
Go AP Physics B!</p>

<p>I would be very happy/surprised if I got a 5. i self studied and it really doesn’t matter for me if I get a 3,4 or 5 cause i get the same credit. Hopefully got a 4.</p>

<p>At least you can earn credit, because the college I will be attending does not even offer credit.</p>

<p>yeah thats true. rocketman did you just take the test because you are interested in physics and want to see how much you know?</p>

<p>FRQs are up </p>

<p><a href=“Supporting Students from Day One to Exam Day – AP Central | College Board”>Supporting Students from Day One to Exam Day – AP Central | College Board;

<p>Can we talk about the specific free response questions since they’re up?</p>

<p>yeah we can</p>

<p>Does anyone else feel that this test was unfair compared to previous years? They ask the same style of questions for like 10 years straight, if you did past papers before this exam you know what I’m talking about, once you have done 5-6 papers you get the pattern and proceed to do well on all later exams. Pick last year or the year before, those exams had the same heat engine questions as always…This year, its not that the material got more difficult, its just that they changed the style in which they ask questions and thus we have an unfair disadvantage to previous test takers who could, to a certain extent, look at the question without reading the text and know what college board was asking for whilst we had to get accustomed to this new style of questions, which not only consumes processing power, but also precious time. </p>

<p>/end rant</p>

<p>yeah agreed the questions seemed different than those of any other year</p>

<p>alright so can anyone explain number 7 C?
how do you possibly answer that question?</p>

<p>U = qv and v = kq/r
so what did is use the calculated energy from (b) and that is U. solve for r. i dont know if this is right though.</p>

<p>You just do E=m*c^2…i think</p>

<p>Alight. So you set kinetic energy equal to the potential energy of the protons in the uranium nucleus. You get:</p>

<p>1/2mv^2 = k(92)e^2/D. Then you rewrite the equation as
(184ke^2)/(mv^2)= D. Then you plug stuff in and solve for D.</p>

<p>Why do you all complain about how much harder it is one year versus other years? How many people do you seriously think study as much and see the difference? If y’all say it was way more different then the previous exams, then be assured that the curve will be rather forgiving. </p>

<p>Tl;dr: Not everybody takes a million practice exams, so if you did bad, then everybody else did too. </p>

<p>Sent from my Desire HD using CC</p>

<p>why is potential energy k(92)e^2/D</p>