The Official AP Physics B Thread

<p>no it was in the 500s, u do pv=nrt, were n is the mass divided my the molar mass, then you do p1v1/t1=p2v2/t2 for the second one and get a temperature in the 800s</p>

<p>Hey guys…
I think I totally messed up the MC :(<br>
I rushed through it cuz I thought I wouldn’t have time and probably made mistakes…
MC was easy in general right??? I got so nervous and I couldn’t concentrate(which was the most stupid thing you can do during an ap test ) any ways…
What do you guys think the curve is gonna be?
how many points or percentage do you have to get right to get 5 or a 4?
My friend told me 80% but some other person that I know told me 60%…
I REALLY wanted at least a 4 :frowning:
Can anyone confirm this?</p>

<p>@wthalexis, the temperature WAS in the 500 kelvin… but the spring constant for #1 was 490~</p>

<p>yeah, i got CLOSE to 490
what quantities did u guys graph??</p>

<p>h and 1/m :)</p>

<p>oh my bad, is it true that all the formulas needed to answer all the questions are on the formula sheet</p>

<p>dang did you HAVE to graph h and 1/m???</p>

<p>do you think its possible to bomb #1 on the frqs and still get a 5 if you do well on the mc and decent on the other frqs?</p>

<p>for sureee, its around 106 out of 180 so yea.</p>

<p>pigs, idk if you HAVE to… but it’s how it should be done… i mean, i heard some people graphing h and x^2g/m or some ****, but it’s kidna dumb cus thats full of constants… you’re not supposed to put the constants in there :P</p>

<p>^yeah i graphed the constants but still got the same answer!!!
well i didn’t know…wasn’t thinking about it fully and i was under the clock too! and i haven’t had lab experiences because well…it’s kinda difficult when ur taking ap physics online lol</p>

<p>lol, i didnt have any lab experiences or anything… i’m just saying…
say you have y=2x, and you graph y vs x, right?
you don’t graph y vs 2x :P</p>

<p>well it was a curve ball!!
but it still worked!!</p>

<p>zero lab experience? oh my.
it’s certainly not the RIGHT way to do it, but they won’t penalize you too heavily, if at all.</p>

<p>dude, pigs… i think you REALLY messed up. i think you’ll prolly get a 3 now :S</p>

<p>^you’re gonna make piggy cry =[</p>

<p>3??? how come</p>

<p>Doesn’t graphing h and 1/m make the slope either 1/mh or hm depending on which quantity is on which axis? How do those values give you the spring constant.</p>

<p>Plus, wouldn’t the units of that be either 1/kgm or kgm?</p>

<p>guys, i was being silly…piggy is not crying
u were supposed to graph h and 1/m but u could’ve done it other ways to come up with the same slope (what i did)</p>

<p>Doesn’t graphing h and 1/m make the slope either 1/mh or hm depending on which quantity is on which axis? How do those values give you the spring constant.</p>

<p>Plus, wouldn’t the units of that be either 1/kgm or kgm?</p>