<p>I just broke my right pointer finger, by my roommate dropping a tv on my finger when he was trying to install it on a wall mount ■■■, and I use my right hand to write</p>
<p>yeah IRJunkie the square root of 20 is not 20…</p>
<p>
</p>
<p>Actually, is it thrown upwards or downwards? Is it thrown 20 m/s horizontally? I call foul on the Barron’s author. Poorly written question.</p>
<p>Very very poorly written question.</p>
<p>yea it doesn’t even say…</p>
<p>Can someone explain to me average angular speed and angular momentum? Is angular speed just the change in theta over time?</p>
<p>PKWsurf according to the Physics B Topic Outline, angular momentum isn’t even on the AP Physics B exam. It’s C material.</p>
<p>[AP:</a> Physics B](<a href=“http://www.collegeboard.com/student/testing/ap/physics_b/topic.html?physicsb]AP:”>AP Physics C: Mechanics – AP Students | College Board)</p>
<p>I know your pain - my teacher spent a few weeks on C material that I’ve only recently found out we don’t need.</p>
<p>
</p>
<p>That’s Physics C. If it ever appears on Physics B, it might be one MC. </p>
<p>In short, it’s irrelevant.</p>
<p>3 questions that I don’t have the answers to. I think it’s from the 2008-2009 practice test so if anyone has that answer key I’d be very grateful.</p>
<ol>
<li>An object is projected vertically upward from ground level. It rises to a maximum height H. If air resistance is negligible, which of the following must be true for the object when it is at a height H/2?</li>
</ol>
<p>a) its speed is half its initial speed
b) its kinetic energy is half of its initial kinetic energy
…pretty sure the rest are wrong</p>
<ol>
<li><p>A ball that can float on water has mass 5.00kg and volume 2.5 x 10^-2 m^3. What is the magnitude of the downward force that must be…
[my only question on this one is, does the “downward force” it asks for include gravity? Like if you calculate the buoyant force, is it just the additional force required or all forces pushing down on it, thus including gravity?]</p></li>
<li><p>The temperature of an ideal gas is directly proportional to which of the following?
a) average translational kinetic energy of the molecules
b) average velocity of the molecules
c) average potential energy of the molecules
d) average momentum of the molecules
e) none of the above</p></li>
</ol>
<p>
</p></li>
</ol>
<p>I’m unsure but:</p>
<ol>
<li>B</li>
<li>Force gravity (i.e., weight) is important.</li>
<li>A</li>
</ol>
<p>I think 20 is A.</p>
<p>EDIT: Do you have a link for the test?</p>
<p>I have a link but its in my school system so you wouldn’t be able to access it. Sorry :/</p>
<p>[If it makes you feel any better, it’s cut off near the end; only 58/70 questions]</p>
<p>Wanna explain why 20 is a)?</p>
<p>Yes, 20 should be A. It is square-rootly proportional to the speed, but directly proportional to the average kinetic engery (1.5KT)</p>
<p>7 is definitely B</p>
<p>20 is def A</p>
<p>V=rad(3RT/M)</p>
<p>Kind of last minute but does anyone have any old multiple choice questions?</p>
<p>Best of luck to all of you!</p>
<p>trf - try ap.testfrenzy.com; the tests seem to be legit but I haven’t tried them myself, so use with caution I guess</p>
<p>and yeah I’m going to sleep now. Couple hours of studying tomorrow and then we’ve got it. Good luck everyone!</p>
<p>Are there any tips for the FRQ? For example, in Bio, you are supposed to write down everything you know about the topic to get as many stray points as possible. Since Physics consists of solving questions, does the Bio tactic apply?</p>
<p>thanks zoaxanthellae that site looks great</p>