<p>I got a and c of that wrong, so I'm just copying Kitty's explanation :P.</p>
<p>:P letter a is wrong! It is 10.370! for the explanation, I put that the radius is decreasing, so the particle along the line is moving closer to the origin at that speed. For letter c, I put that its y-component of velocity is going up with a speed of .5 at that point. (something along those lines)</p>
<p>Happy? :P</p>
<p>I emailed CB asking them to accept 10.371 as an answer, I encourage you all to do the same! email: <a href="mailto:apexams@ets.org">apexams@ets.org</a></p>
<p>Wow, I feel like a real nerd right about now...</p>
<p>Now let's just hope those explanations are good enough or the name Christm4sKitty will become synonymous with failure :[ </p>
<p>But yes, I shall fight for the cause!</p>
<p>anyone realize that form b was soooo much easier (and more like previous tests) than form a was????? </p>
<p>whats up with that? thats so unfair. do you know who actually takes form b or what the curve is like (is it separate from form a's?)</p>
<p>goodnesssssss thats ridiculous</p>
<p>Yea we know, but there is nothing we can do about it except hope the curves are separate for each form (I doubt it).</p>
<p>greeeeeaaaat anyone have a slight idea as to what the cutoff for a 5 will be this year?</p>
<p>WHAT????
no! that's so not fair!!! form b should be about the same level of difficulty! something fishy is going on here...</p>
<p>B does seem pretty easy, but A was not too difficult. I'm sure even if they don't use two different curves and see a major difference between the grades of the two exams, they will probably do something in order to prevent any court action.</p>
<p>Christm4sKitty, that sounds like the reasonable thing to do.</p>
<p>oh another question, what happens if you get part a of a queestion wrong and other parts depend on that answer? are those other parts wrong as well then??</p>
<p>I can see it now: Collegeboard vs. US - upheld separate but equal for test versions.</p>
<p>I didn't divide the radius by two!!
I just want to answer ONE problem right!!!!!!
tear*</p>
<p>Question:</p>
<p>For 4b, I put dV/dt = (4/3<em>pi</em>3<em>30^2</em>2.0) which = 7200 (correct answer)
However, I stupidly tried to simplify that, and I got some completely wrong answer. This was the answer I boxed, but I have the actual answer earlier on the page (the boxed answer is the answer with the units). Will I receive full credit?</p>
<p>Hey guys, could you please tell me if I did 2a correctly? I am doubting myself on everything.
I did integral from 0 to 3 of (f(t) minus 250)
and then integral from 0 to 7 of (f(t) minus 2000)
added those together.</p>
<p>Is it right?</p>
<p>And on 2b, intead of using the notation U(union) I used words for my answer. I said amount of water is decreasing from time t=blah blah blah to t=blah blah blah and from t=blah blah blah to t=blah blah blah.
Is that okay?</p>
<p>I would appreciate it if you guys respond.</p>
<p>
[quote]
And on 2b, intead of using the notation U(union) I used words for my answer. I said amount of water is decreasing from time t=blah blah blah to t=blah blah blah and from t=blah blah blah to t=blah blah blah.
Is that okay?
[/quote]
That's completely OK.</p>
<p>Solution for 4: <a href="http://img153.imageshack.us/img153/5963/07calcbcfrq4rs3.jpg%5B/url%5D">http://img153.imageshack.us/img153/5963/07calcbcfrq4rs3.jpg</a></p>
<p>I'll do 2 and 5 if someone gives me a good explanation for the stuff. I don't like explanations.</p>
<p>i think so maybe? i can't view the questions, can someone pm them to me so i can get back to you?</p>
<p>To Hazhulken [re: 4b]:</p>
<p>Nope. You'll have earned the answer point and then lost it by mis-simplifying.</p>
<p>To Yatta!, re: answer rounded to 4 places causes inaccurate rounding to 3 places:</p>
<p>I don't think it will work, but it's worth a try. I know there's a precedent for accepting an alternative answer that is not accurate to three decimal places.</p>
<p>Basically, the issue came up with the calculation of an integral. On one of the questions, calculating the integral using fnInt on the home screen provided a different answer than using the integration feature within [2nd][TRACE].</p>
<p>Truthfully, the calculator integration feature on the TI-83/84 doesn't integrate at all, it merely does a Riemann approximation with different numbers of rectangles. fnInt uses 100,000 (if I recall correctly) per unit of x, while the other feature uses fewer (I want to say it's only 1,000 per unit of x). Once the College Board figured out where the inaccurate answer came from, they accepted both, although I've been told at a workshop that this isn't necessarily a binding precedent.</p>
<p>It's worth a shot, though. :)</p>