<p>I have a few questions:
If I am taking a Physics B class, will I be able to do well on the Physics C test with no self-study as long as I am good in Calculus?</p>
<p>Am I allowed to take both Physics B and C in the same Year? Can I take all 3 in the same year?</p>
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<p>No. There are a few new topics introduced in Physics C, and you really have to learn the calculus that applies to them and understand them thoroughly in order to get a good score on the exam. </p>
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<p>Yes. However, you would have to test late for Physics B.</p>
<p>I was wondering whether anyone knows where to find any other released multiple choice exams for both AP Physics B and C</p>
<p>i think i’m going to fail the physics c test lol</p>
<p>I think I’ll pull at least a 3/4 on Physics Mechanics… It’s Calculus AB that I’m worried about.</p>
<p>fledgling, will I be able to do well if I just go over a PR or Barrons book for Physics C? I got a 5 in Calc BC and will easily get a 5 in Physics B.</p>
<p>Depends. I’ve heard of cases of people being able to score 5’s with only looking through Barron’s, but keep in mind that those cases are very rare and certainly do not apply to everybody. That being said, you should be able to do that for Physics C: Mechanics since that portion of the exam is generally considered to be easier. E & M is a bit more abstract though.</p>
<p>^I did that for both mech and e/m :D</p>
<p>If you can go through Barrons, understand how they solve all of their examples/sample problems, catch their typos, and then answer about ~75% of the practice problems at the end of each chapter correctly, then you’re set for 5s. Also, don’t bother with the practice tests. Half of the questions on their practice tests are “lolwut what kind of a question is this” questions; just practice with old FRQs and released MCs if you can get them. Barrons practice tests test remote topics and are much harder than the actual test, although you’re welcome to try them if you wish.</p>
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it depends on your aptitude for the subject. do you understand the deeper meaning of physics concepts as well as calculus ones, not just how to evaluate equations?
if so, then I definitely think you should do it.</p>
<p>Hi,
I need some help with Physics B questions about momentum.
I’ve been trying to solve the problems but just can’t get my answers to match the solutions.</p>
<p>Can you please check them out?
And will the real exam be this hard?</p>
<p>Please follow the link to see the questions:
<a href=“http://talk.collegeconfidential.com/college-admissions/1124355-physics-questions.html[/url]”>http://talk.collegeconfidential.com/college-admissions/1124355-physics-questions.html</a></p>
<p>Thanks.</p>
<p>Agh finally started studying for the Physics B test… I’m not taking the AP class along with it; instead, I’m taking our school’s regular physics course (which goes super slow and focuses mainly on projects and other unrelated things). Right now I’m just reading the Princeton Review book and doing the problems in there…do you think that will be enough to pass the test?</p>
<p>Question.
When a particle of positive charge is projected with a velocity along the plane of a page into a magnetic field that points into the page, why does the magnetic force on the particle resemble centripetal force?</p>
<p>If a magnetic force is present, it points at an 90-degree angle to the motion of the object. A force that always points perpendicular to the direction of motion is a centripetal force.</p>
<p>My teacher lagged on teaching optics.</p>
<p>Can I still get a 4/5?</p>
<p>You have a little less than two weeks. Go get yourself an AP prep book if you can and you’ll be fine. Optics/Waves/Modern Physics are relatively easy subjects that require only a few hours to understand. Besides, Optics make up for only 10% of the test (I don’t remember the rest), and you only need a 60-70% to get a 5.</p>
<p>It’s not hard if you try. Seriously.</p>
<p>I hope that curve for Physics C is correct…but I’ve heard that it’s 65% to get a 5.</p>
<p>I studied over modern physics and optics… Actually kind of fun. After taking some practice tests I’ve noticed you don’t get an equation sheet. And some questions ask questions that deal with some of the more complex equations. That’s a little crappy. Why would they do that?</p>
<p>“An ice skater is spinning about a vertical axis with arms fully extended. If the arms are pulled in closer to the body, in which of the following ways are the angular momentum and kinetic energy of the skater affected?”</p>
<p>Apparently the answer is that angular momentum remains constant and Kinetic energy increases. But isn’t angular momentum equal to mvr? So wouldn’t a smaller r make L smaller? On the other hand, which contradicts what I just said, I thought angular momentum increase when you brought your arms in closer.</p>
<p>Another about angular momentum.
“A cylinder rotates with constant angular acceleration about a fixed axis. The cylinder’s moment of itertial about the axis is 4 kgm^2. At time t = 0 the cylinder is at rest. At time t=2 seconds its angular velocity is 1 radian per second.”
I calculated the angular acceleration to be 0.5 radians/s^2 already, but how do I find the angular momentum at t=2 seconds, and the kinetic energy at t=2 seconds?</p>
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<p>“A particle is moving in a circle of radius 2 meters according to the relation theta = 3t^2 + 2t. The speed of the particle at t=4 seconds is :”
I got 26 m/s by taking the derivative and plugging in 4. The answer is 52 m/s. Is this because of the radius or something? Not sure how that comes into play.</p>
<p>For the skater question: While r decreases, v increases. When you pull arms in, you spin faster. So v increases, increasing kinetic energy. And all kinds of momentum (linear, angular, etc.) are ALWAYS conserved.</p>
<p>how much does simple harmonic motion show up on the physics c mechanics exam?</p>
<p>^^Good question, I hate that!</p>