<p>Anyone have predictions on what the free response will be like? Any “oracle teachers” (as 5 Steps might say) out there?</p>
<p>can someone explain number 10 and 11 from 2009 physics b exam mc? thanks in advnace :D</p>
<p>10)change in internal energy = 3/2 nR (Tf-Ti). since press decreases by half and v increases by half, using pv/t = pv/t the temp doesnt change. hence internal energy doesnt change (0J).</p>
<p>11)work= area. area veritcal line =0
U=Q+W w=0
u=Q
1000J</p>
<p>1eye651 where does the 3/2nRT equation come from?</p>
<p>well, its a known formula in the course. it is derived from pv=nrt but i don’t remember the derivation.</p>
<p>it’s a random equation you have to memorize. it just says that internal energy goes up proportionally with temp.</p>
<p>so um i feel really good about newtonian and fluids(i learned this in chemistry) and ok in e+m. However, i really dont feel good about optics and atomic. How far does my score fall?</p>
<p>isn’t it like 15 percent? there’s always a FRQ on that topic, and probably 3-5 questions on it on the MC</p>
<p>my teacher never did a good job teaching the last two (well she didnt do a good job the whole year, but the others arent that bad). i kind of understand snell’s law, v=f(lambda) and speed of light, and the angles of incidence, but i dont get ray diagrams and that looks big</p>
<p>ah, do you have a review book? it should be able to teach yo uthe basics of ray tracing – it’s not that hard.</p>
<p>take a look at the work function and photoelectric effect and energy diagrams if you have a chance. that should cover the majority of modern phys.</p>
<p>Too…many…formulas…brain…overloading <em>collapses</em>.</p>
<p>hang in there :P</p>
<p>I actually got a 4 on a mock that I took recently and I didn’t study, but I’m looking at Princeton Review and I don’t remember learning a significant amount of what’s covered in the book so I’m pretty nervous for the test now. Man I wish we had a formula sheet for MC. That’s my biggest issue: remembering formulas.</p>
<p>yeah i have a kaplan review book… its helped me a bit… </p>
<p>i took a practice test, and i noticed it isnt too hard to get a 3… i got 29/70 on multiple choice and 30 on free response (i wasnt trying that hard though, im pretty tired)</p>
<p>well… remember v=vo+at, v=ir, f=ma, g(m1m2)/r^2, stuff like that cause that appears commonly</p>
<p>yeah, memorizing those equations comes after doing lots of actual problems/</p>
<p>You know you’ve done too much physics when you are memorizing formulas in your dreams…</p>
<p>I’m screwed for tomorrow guys…</p>
<p>So how many of the MC questions are problems where the answer can be derived or understood just by using knowledge from the formulas?</p>
<p>Can someone post up the list of formulas mainly used in the multiple choice section (the formulas we need to study for the MC part, the major and important ones)?</p>
<p>Thank you so much, it will save a lot of time, greatly appreciated!</p>