<p>I don’t think there’s enough time to finish all E+M topics, so I decided to secure a 5 on the mech exam.</p>
<p>Anyone willing to trade AP EXAMS for Answers?</p>
<p>I need the AP PHYSICS C MECHANICS MC EXAMS. Whatever year, doesn’t matter. If you are willing to send it to me, I’ll send you guys the answers when I complete it.( They will be correct, you guys don’t need to worry about that) I GUARANTEE THAT YOU GUYS WILL RECEIVE YOUR ANSWERS. If you don’t trust me, you can send it to me in parts and send me only additional questions when you get the answers to the first part. </p>
<p>Let me know ASAP or I’ll have to purchase the exams. Thanks!</p>
<p>A 500 g object is moving a horizontal frictionless surface. Its displacement from the origin is given by the equation: x(t) = (3.50m)sin[(pi/2)t + 5pi/4].</p>
<p>a)what kind of motion is this?</p>
<p>b)what is the amplitude of this motion?</p>
<p>c)what is the period of this motion?</p>
<p>d)what is the frequency of this motion?</p>
<p>e)what is the linear velocity of this motion?</p>
<p>f)what is the linear acceleration of this motion?</p>
<p>g)what is the maximun kinetic energy of this system?</p>
<p>h)What is the maximum potential energy of this system? </p>
<p>i)What is the total mechanical energy of this system?</p>
<hr>
<p>Asin(wt+o) A = amp, w = angular frequency, t=time, o =phase constant</p>
<p>a)Simple Harmonic Motion
b)Amplitude: 3.4
c)w=2(pi)f so f=w/2pi=(pi/2)/(2pi)=1/4 (Not sure about this one, but i think it’s right)
d)pi/2
e)Take the derivative: v(t)=(3.5pi/2)[cos((pi/2)t+5pi/4)]
f) Take the derivative of v(t): a(t)=-3.5(pi/2)^2[sin((pi/2)t+5pi/4)]</p>
<p>g)Find where a(t)=0 and plug that into 1/2mv^2: so a(t)=0 at t=3/2. Solved by setting (pi/2)t + 5pi/4= 2pi (That’s when acceleration will be zero because sin(2pi)=0) So plug that into velocity to get the value v(1.5)=5.49. SO KE=250(5.49)^2=7535J (7.54KJ)</p>
<p>h)Potential should be the same thing. When potential is greatest, Kinetic is zero. And vice versa. So Max Potential is 7535J as well.</p>
<p>i)Mechanical Energy is the sum of potential and kinetic energies so</p>
<p>in part (c) we are looking for T=period. I believe you made a typo for Amplitude (3.5). And part (g) is good. However I found an easier way of computing KE(max).
We know that KE(max) is when the velocity is greatest. If we look at the velocity function: we see that the greatest value of cosine is 1 (trig). Therefore we obtain V(max)=3.5(pi/2). Then you just have to subsitute this in for KE=(1/2)mv^2, and you get the same answer.
Good work nigcrunch, its a long problem.</p>
<p>Yeah. So for c). T = 4. Since T=1/f. I just forgot to write it. And about (g), you were right. I just over-thought it. Cause Cos and Sin are just going to oscillate between 1 and -1. Either works out though. Was this a problem from a review book? Or an old AP Test?</p>
<p>I found this problem here: <a href=“http://www.ucopenaccess.org/course/view.php?id=73[/url]”>http://www.ucopenaccess.org/course/view.php?id=73</a>
It is a useful resource, I think we should discuss those problems in this thread.</p>
<p>Does anyone know where to see a sample of released multiple choice problems ?</p>
<p>Do you guys want a 5? [Palisades</a> Charter High School](<a href=“Palisades Charter High School”>Palisades Charter High School)
@CMUGUY2014 go to this link!</p>
<p>These are problems we should discuss here!!!</p>
<p>@xxs
Thanks!! but then I see no answers, which is why you said we can discuss them here???</p>
<p>This is why I thank God for this site, the answers are on the same page:
For example: Free Response Questions(only) Document title: “1977 C Fr.pdf” and the corresponding Solution Guidelines: “C1977.pdf”
You have scroll down to see the pdf answers. I hope this helps!</p>
<p>Hey, great link CMUGUY2014 (I applied to CMU as well, hope you do well with the admissions process unless you already got accepted).</p>
<hr>
<p>I wanted to share this with my fellow AP Physics C test takers</p>
<p>I’ve compiled all of the files on the Collegeboard and on the Palisades High link, and I take no credit for the files created. However, this compilation will make it easier to access so that people do not have to click through each link and download each file. Here now you can have all the files in one folder.</p>
<p>Link: [AP</a> Physics Released Questions 1973-2009](<a href=“http://www.mediafire.com/?uh3lmw2yjum]AP”>http://www.mediafire.com/?uh3lmw2yjum)</p>
<p>Hope this helps someone!</p>
<p>@ xxsteelxx and nigcrunch
Thanks a looooooot!!</p>
<p>EDIT::: I Posted an old link that only contained what collegeboard had. </p>
<p>Here’s the real link</p>
<p>Link: [AP</a> Physics C Released Questions 1973-2009](<a href=“http://www.mediafire.com/?ynzn4l5y2mg]AP”>http://www.mediafire.com/?ynzn4l5y2mg)</p>
<p>Sorry about that</p>
<p>Thanks NCrunch!</p>
<p>Yes, I’m already accepted to CMU. Good luck- -decisions are mailed this Wednesday.</p>
<p>Hi,
Is there a clean version of the MC questions…??? Some of the zipped files and some of thsoe from the PC high school have the diagrams blacked out (Like a CIA report)!.. : {</p>
<p>Actually
Looks like the 2004 MC is blacked out??</p>
<p>I’ve printed the 84, 88, 93 and 98 MC and answers …</p>
<p>there’s huge gap 98 to 2004…and until now- wish we could see 2008 or 2009 MC ?s</p>
<p>Anyone have another link to a clear look at the diagrams, figures in the MC ?s for 2004?</p>
<p>AHHH 6 weeks
So glad it’s after Calc BC</p>
<p>Hey guys my 2004 diagrams are showing up. </p>
<p>I converted to PDF and uploaded separately:</p>
<p>Link - [2004</a> MC](<a href=“File sharing and storage made simple”>http://www.mediafire.com/?zz1zy5hfjdy)</p>
<p>The diagrams should appear.</p>
<p>Does anyone have any other MC questions?</p>
<p>@mom2012and14 </p>
<p>I doubt that there are much more (if any) than what has already been linked. The Collegeboard releases their multiple choice very sparingly.</p>
<p>is fluid mechanics/thermodynamics going to be on the mechanics portion of the test? cause we didn’t go over those topics…</p>