<p>For 3 I got
(a) theta’‘=(-B/I)theta
(b) theta’'=-(w^2)<em>theta
w=sqrt(B/I)
T=2pi/w=2pi/sqrt(B/I)
(d) something like T^2=140I+1.5
(e) T^2=(4pi^2)/(B/I)
B=(4</em>pi^2)*I/T^2
(f) It is what T^2 is when I=0</p>
<p>^^That makes a lot of sense; thanks!</p>
<p>There was just so little time and so little space on 1(e) and 1(f), haha.</p>
<p>@AP -Physics : And you, sir/m’am, need to calm down. Attacking one for something as ridiculous as “phrasing” accomplishes nothing, and only destroys the credibility of one’s self. If you remember, i originally just said that the problem could be solved using common sense and/or critical thinking. It was only when someone asked how to actually solve such diff eqs w/o using integral calculus, that i responded - to show that no question required integral calculus.</p>
<p>Assuming the pomposity of someone based on ones own inner feelings is a dangerous endeavor, and the words across the screen have no inflection to them. </p>
<p>And your assumption that i do not think there are people who know advanced math/physics on this thread is quite farcical. I’m pretty sure anyone can see the tons of people on this site that have self-studied “Galois theory” or “Abstract Algebra” or some other high level college math. I am also not the only one to have gotten most of the answers (FRQ)at least partially correct. Furthermore, there are often college veterans on these threads. Your assumption, therefore, serves no purpose.
If anyone is willing to conclude that I sound/am “stupid” or “uneducated” based off a ridiculously small sample of 6 or so posts, feel free to take it up with me. :P</p>
<p>Furthermore, your assumption that I should not discuss that I felt that the test was easy because it is some assumption of “self-importance” on my part is also illogical - you cannot will this as universal law: that one can only talk about a certain test on an online forum if they feel they failed it - that lacks proper discussion, and few people will be able to ascertain the false answers from the true. And i think i mentioned the test was easy once? twice?
Now can we at least get back to what this thread is supposed to be for - discussing the FRQ, their answers, and the methods, for the AP Physics C exam?</p>
<p>Okay, no need to be silly. APphysics2011’s comment was unnecessary, as was your long-winded retort.</p>
<p>Looking at what you guys have said, I pwned Q’s 1 and 3 for Mech but botched 2 a lot. Yay :D</p>
<p>If i got for number 1 all of a to d, how many points do u think i will get? Also for number two if i missed only part b and i forgot to insert the +C for e, how many points is that?</p>
<p>
</p>
<p>I don’t think that was on the FR. But the formula is v=sqrt((dx/dt)^2 + (dy/dt)^2)</p>
<p>Would the graders give credit for a process that is different, but comes up with the same solution?</p>
<p>^duh 10char10char</p>
<p>^^Unless it’s a flawed process that just so happens to generate the correct answer.</p>
<p>^Oh, it was there, all right.</p>
<p>So…if I got 30+/35 on the MC and ~15/45 on the FRQ (lol), what kind of score should I expect :s?</p>
<p>^on the mechanics test, that is</p>
<p>Well, if you’re really that confident in your MC score, you equate to about a 59%, which is a high 4…I don’t think the curve will be easy enough for that to be a 5, but if everyone did as well as you on the FRQ, then you might be in luck for a 5 
I’d guess a 4 though, just in case you missed some of those MC’s you were confident in.</p>
<p>you cannot will this as universal law: that one can only talk about a certain test on an online forum if they feel they failed it - that lacks proper discussion, and few people will be able to ascertain the false answers from the true. And i think i mentioned the test was easy once? twice?</p>
<p>A. Did you really just bring Kant into an online physics discussion? I’m pretty sure there are a large variety of issues with this, many of which don’t need to be discussed here.
But regardless, I believe the issue he had was you deriving pleasure from saying it was easy when so many said it was hard = you did it just to make yourself look smart (like sure you could say it was easy, but then why did you need to throw in that you didn’t need a calculator - that part could be seen as overkill). While I can’t determine your motives, if that is the case, that would clearly violate the categorical imperative through a perfect duty.
B. I doubt you actually meet the categorical imperative and live by it in your daily, so it shouldn’t be your goto for answers about should. (If you do actually believe you live by it, I would love to have a philosophy discussion with you, since you already concede it can apply to online forums). Just because you don’t have a moral imperative not to do something doesn’t mean you should - it’s morally permissible under one standard. Also, it probably does violate a standard of utility as it likely did [annoy] a few people at a minimum. </p>
<p>In conclusion I definitely feel like someone of your (perceived) intelligence would know the response to expect from your initial post. Whether or not you care to admit that doesn’t really bother me, although I can’t speak for others.</p>
<p>@nicks- that’s about what I thought 
I did think the mc was about that easy. But I also think (hopefully) I am underestimating by a bit with 15/45 on the FRQ’s. Guess I’ll just have to kill the anticipation until July lol</p>
<p>Oh… nvm, it is MC*45/35+FR score, you just did it out of 100, not 90.</p>
<p>I think 55 ish could be a 5 (number not percent) so it’s a conceivable 5.</p>
<p>^^55 is definitely a 5… In 2009 all you needed was a 50 while in 2004 all you needed was a 52.</p>
<p>
</p>
<p>That was the one that needed sqrt((x’)^2+(y’)^2), and the answer was definitely there.</p>
<p>Lol, no way. I could get just 20/35 on the MC and 15/45 on the FR and STILL get a 4 (according to [AP</a> Physics C Score Calculator](<a href=“http://www.free-test-online.com/ap/ap_physicsc_score.html]AP”>http://www.free-test-online.com/ap/ap_physicsc_score.html))</p>
<p>hmmm. Maybe I did get a 4.</p>