<p>@JDong</p>
<p>My result for power was ugly. I always doubt myself when these things happen. Was yours complex too?</p>
<p>Mechanics:
MC: skipped 8, didn’t really guess on any, maybe missed a few
FRQ: I spent too much time on 1 because my calculator was set up weirdly. I thought that #3 was the easiest because it was the most “mathy”, though I may have made some calculation errors, and I didn’t get to the second half of 2.</p>
<p>Hopefully, the curve will be nice. What does it usually take to get a 5 or 4?</p>
<p>55/90 for a 5 in mech in 1998. But I hope it’ll be lower this year since everyone has been saying it was difficult.</p>
<p>The MC on mechanics was not that hard, it just took forever. I had to skip 3 and I felt really rushed through the whole section. We were in the same room as Physics B, so they were all talking since the proctors started us first. I couldn’t concentrate for the first 10 minutes. The FRQs were surprisingly easy for me. I just didn’t get the last part of #3 and one part of #2. </p>
<p>I’ll be taking the late test for E&M because the guy who runs AP exams at my school screwed up and didn’t sign me up in time. I’m self studying though and I need more time anyway so I guess it works out. Just hoping the curve isn’t a lot harder.</p>
<p>yeah, time was a real issue. Especially since I had an injury on my right hand this past weekend. : (</p>
<p>How the…work is the integral of Fdx. If you have Force as a function of time, how do you find the work done by it?</p>
<p>What question was that for…</p>
<p>mechanics frq #1, part B i think.</p>
<p>find the work done by the force of the rope</p>
<p>OH you mean the one with the skier. I don;t really remember what I did and I might be mixing this up with one of the E&M FRQs but I used work-energy theorem.</p>
<p>I did not have any idea how to apply the theorem… so I just wrote that the terminal vel is obtained when a=0 (t=T) and Work is ∫F●ds hoping for partial credits.</p>
<p>This is my question, does the arrangement of capacitor and resistor matter? For #2 in E&M, the first part was to easy too be real i thought… was I=0??</p>
<p>and for the charge after a long time, is it going to be just CV no matter where the resistor is??? (Confused me alot cause I always saw that books set capacitors before the resistor)</p>
<p>I honestly had no idea what the charge would be after a long time, but I think I got the rest of that question. I had zero initial current too. 2.25 and 600 pop out at me as well</p>
<p>I am sure two resistors and two capacitors were in parallel. 40 ohms with 10 micro F, 20 ohms with 5 micro F, the emf was 30V, i guess. </p>
<p>There was a switch conneting the upper part to the lower, so that if you close the switch, those two resistors will be at series. I remember getting 2.25 somewhere… but I think I erased it after all… F***…</p>
<p>I do remember getting 600 J for either energy stored in the cap or dissipated in the resis. The number popped out so nicely and I was so happy :P</p>
<p>Zero initial current for both parts yes?</p>
<p>I wrote a big 0 and left the rest blank, and it seemed awfully blank.</p>
<p>I didnt do well on the rest… I dont remember 2.25 or 600</p>
<p>Since the current was zero… I got from Kirchoff that Q=C *emf</p>
<p>the mech MC was tougher than any year ive done before, like im only expecting a 22 or 23 raw score, i left 2 blank
the mech FRQ killed me, hardest ive ever seen, #3 was deadly, #1, #2 were ok, but i misread part of 2 and screwed up the constant in 1, i probably got around 25
the e&m MC was also tougher than any year ive done before, im expecting a 23 or 24 raw score
the e&m FRQ was really easy, #1 was sorta hard, left 1/3 blank, BSed a third, and knew what i was doing for a third, #2 was a joke (I=0 for (a) and I=0.5A for (d)), and #3 i messed up the lightbulb one but remembered to integrate the flux and differentiate for the power, i got around 35
im expecting i 5 for sure on e&m
for mech, im around a 4/5 borderline, if theres a super low curve this year, i can get a 5, if not, probably a 4
i was so nervous and was freaking out when i saw the mech test and the e&m MC, i was like holy **** holy *** *** is going on?!</p>
<p>what do you guys think about the curve for E &M and Mech?..and i wanna ask did the bulb go dimmer or what??..I did horrible in MC for mech and did well in but the opposite in e&M</p>
<p>i put the bulb got brighter but the answer is it stays the same
i forgot why tho</p>
<p>I found the Mechanics MC to be really easy. I studied a ton before the test and had two years of Physics experience going in so I thought I was super-ready. I used the AP Advantage book and read it like 4 times. But Terminal Velocity isn’t covered in that book, so I was screwed out of the gate on problem 1. Problem 3 was an absolute killer, so hard and time consuming. Fortunately parts c and d were pretty easy, I think, and I just drew a random exponential curve going to the constant for the graph so maybe I got some credit there. No way I got any points on problem 1 except maybe the graph, where I just did a vT vs. m graph. Problem 2 was the only one I might have gotten right, but only if part d was a conservation of momentum in the x direction problem, which doesn’t make sense because they must have given you h for a reason, right??? Anyway, at least 11/15 on that. So maybe, say, 20/45 on FRQ? + probably at least 28/35 on MC I think I’m clear for at least a 4 probably a 5 if the curve is lower. </p>
<p>On the E & M the MC was hard as usual. Maybe 20/35-ish. FRQ I thought were very easy. Probably at least 30/45. So we’re good for a 5 there. I’m happy. But really frustrated with the Mechanics FRQ. Why were they so tough?</p>
<p>In general, how have the curves for the Mech exam been in the previous years?</p>
<p>5/8 for a 5, 4/8 for a 4, etc… e ‘n’ m are usually about 8 points lower.</p>
<p>About 62.5% for a 5? Really??</p>