AP Physics B

<p>im pretty sure the 'stopping potential' on the last bit of #7 was the same as the KE-max, they just wanted to see if you understood what that meant, i put the number down, but didnt clearly label it... my friend told me this. anyways ima go call up the office of integrity and tell them how you evil children are discussing MC questions w/o appropriate authorization</p>

<p>If you have KE max of something in eV, then stopping potential is the same number, but in Volts.</p>

<p>Awww...I forgot to label anything on the last question. How do they award credit to students who don't label? Do you at least get half credit or something for having the correct number?</p>

<p>Each seperate part of a question has its own point value. For example, if a question that was worth 15 points had 3 parts (as in, a), b), and c)), each part is worth 5 points. Furthermore, if in part a) you had to, for example, draw a free-body diagram, points might be awarded as follows:
All of the forces are labeled - 2 points
The directions of the forces are correct - 2 points
Components are labeled as such, and sines and cosines are correctly labeled - 1 point.</p>

<p>my 4 or 5 all depends on the curve....108 will probly get me a 5......with a curve like 116 itll be close..too close...</p>

<p>USUALLY, they don't take off for units. They do for some questions. Oh and the stopping voltage, it's the same as KEmax.</p>

<p>darn! i was gonna put that!</p>

<p>U = qV
KE = qv
KE(q) = qV
KE = V</p>

<p>d0h!</p>

<p>damn... i forgot to label the components</p>

<p>I was just giving a possible example...I dunno how the actually distribute the parts for the question.</p>

<p>Not allowed to discuss yet...wait 19 hours, then I'll answer. They could be patrolling the forums and I don't want my score cancelled.</p>

<p>aight i understand. thx for reminding me. i deleted that post. lol</p>

<p>Discussion now open!
I was an idiot and forgot to convert wavelength to frequency on the last FR...rawr. As for your question, crichessill, I didn't even label the tension, I just labeled its components (Tsinx and Tcosx). Bouyance was something like 2.7 centimeters? And something like 11,000 (a little more than that) Newtons for bouyant force?
Field was k<em>q/(a^2), directed downwards?
Apparent weight was just mg, because there was no acceleration at 4 seconds?
How did people set up the lab? I just used the x=m</em>wavelength*d/L...</p>

<p>i got 4 ppl on the raft thing....anyone else?</p>

<p>8 people here...well, actually, 8.4 was the number I got, but that means 8 people max...</p>

<p>i got the same thing gosh. im starting to feel a little more confident about my performance on the exam. a 5 would make me a VERY happy bunny</p>

<p>err, x=m<em>wavelength</em>L/d...sorry, my equation was wrong in my post above.</p>

<p>for the number of people, didnt u have to do 17000- 11000/ something</p>

<p>not sure of the exact numbers , but i got like 84 people fro somereason</p>

<p>What did everyone get for #2 C</p>

<p>i got .3 for height.. and 2. something for velocity</p>

<p>hahahhah the mental image of 84 people trying to fit on that raft is hilarious. i still dont know what the answer is though! i guess 8 then?</p>