<p>Oh yes, other people here to suffer with me D:</p>
<p>At first the electricity questions got me (how does a charge move where x happens, y is near it and so on) once I’m past that I’ll be fine</p>
<p>…I think.</p>
<p>Any tips? Oh, I use the Princeton review, which I recommend to anyone, its a really good book. It easily supplements my Unit 1 Physics (CAPE, Caribbean A Levels) and the only reason electricity doesn’t make much sense to me is because it’s in Unit 2, which I haven’t completed yet.</p>
<p>But as I was saying, any tips on how to get past the elec. questions?</p>
<p>Does anyone have a reference sheet online that covers everything? I tend to forget the little things, like adding capacitance in circuits, stuff like that…</p>
<p>I second the request for the Doppler effect. I saw a terrible question about sound hitting a tree from the PR book, I still don’t understand it.</p>
<p>I don’t think thermodynamics has set into me yet, because I literally just revised it but I can’t remember the 0th law.</p>
<p>1st Law
total heat before= total heat after in simplest terms. Like LOCOM, but for heat</p>
<p>2nd Law is weird, I’ve never seen it in any of my exams, but basically
The level of disorder of particles in an object and its surroundings does not change (particularly, decrease, it doesn’t decrease)</p>
<p>Oh the 0th law is heat flow, like diffusion but for heat, from hot to cold once in contact. Naturally this would be until they both reach the same temps, aka, equilibrium.</p>
<p>Feel free to ask any more questions, it’s helping me realize what I don’t know too!</p>
<p>What always confuses me is Total Internal Reflection/Snell’s Law. Which medium light enters and where it leaves. Think anybody could give a quick and dirty explanation?</p>
<p>@DRS2442:
Doppler effect. The go-to formula is Frequency<em>observed = Frequency</em>source[(v +or- v<em>observer) / (v -or+ v</em>source)]. </p>
<p>Ex: You are hurtling at some screaming lady at 1/9 the speed of sound. She is hurtling towards you at the same speed. Her frequency is naturally 4 Hz. However, in this case it would be = 4[(v + (1/9)v<em>observer) / (v - (1/9) v</em>source)] = 5 Hz. Remember to double check that it makes sense! If you’re moving further apart, the frequency should be lower and vice versa. </p>
<p>0th law of thermo is kinda lame. If object A is in thermal equilibrium with object B, and B is with C, then A is in thermal equilibrium with C. Not much importance there. </p>
<p>@vipersarin:
Snells Law is n<em>1*sinθ</em>1 = n<em>2 * sinθ</em>2.
Ex: First always draw a normal line perpendicular to the boundary between the mediums. θ is always measured from the normal to the incident ray. If light is going from a thick medium (n is large) to a thin medium (n is small, medium is light and airy) then the light will bend closer to the normal. </p>
<p>TIR: The light is going from a thin medium into a thick medium, bending away from the normal. In the case that θ<em>2 is 90 degrees (it goes along the boundary) or more, there is total internal reflection. The critical angle θ</em>2 = arcsin(n<em>2 / n</em>1). Any incident ray greater than the critical angle will not leave the thin medium. It will reflect 100%.</p>
<p>Lol, this test was RIDICULOUSLY easy. My Physics class never included magnetism, optics, or heat, and I could answer literally every question that I was taught. Little things like the ball in the air problem he would shoot off to us at times, some of them he’d already given us verbatim throughout the course. Great teacher. Makes me mad though, I could have gotten a crazy good score if I was taught all that was on here. </p>
<p>I arbitrarily guessed some of the magnetism ones. The one with the circular wire was out of the page, right? (I just assumed the right hand rule applied to magnetism lol) and the one with the two wires going opposite directions, the answer was left, correct? </p>
<p>Did you have to have memorized all the constant acceleration equations to get that projectile motion one?</p>
<ol>
<li>When adding the question with adding the margin of errors? The one with +/- 0.2 and +/- 0.3?</li>
<li>I know sound waves carry pressure and energy? But momentum?</li>
<li>What did you guys choose for the one asking for definition of charge conservation law?</li>
<li>If in the worst case, I missed 4-6, what score do I expect?</li>
<li>How come nobody posts for physics? Math and Biology seem pretty popular today…</li>
</ol>
<ol>
<li>I figured it would be ±5, since if they were both pluses and both minuses it could be -5 and +5 maximum.</li>
<li>I never took studied sound and got it. Momentum = mv, waves have no mass.</li>
<li>Net charge of a system is always constant. Just like the conservation of energy.</li>
<li>800 I think.</li>
<li>I dunno. I thought physics was way easier than math too. The math one was hard for me. And biology is lame.</li>
</ol>
<p>Whew I think i got 3-4 off, but im giving myself some legroom and giving myself 4-6 off. what is it for raw score usually for 800? heard it was 65+?</p>
<p>Yeah, get 10 questions wrong and you’re probably going to get an 800. That’s what I’ve heard. I omitted two, perhaps missed two - three (although I think I missed none). The PR review book for 2013 - 2014 puts a raw score of 60+ at an 800. </p>
<p>I thought this test was pretty hard and Math 2 was so easy and I studied for this and didn’t study for Math 2. It could be due to the fact that I have only gotten halfway through a physic course, but the questions were different on this test from questions n PR/Barrons. What was the answer to question 71 about two currents traveling in directions with arrows. I put II and IV (choice B I think).</p>
<p>@matthew5 having the same situation here haha
i totally missed studying for the math II but thought it was much easier than the last time
and i prepared with PR 2013/14 book for physics and I thought these questions were quite difficult (or at least different than the ones in the book) than on the december test. On the PR practice tests I scored somewhat below 700 so I was pretty confident, but today just blew me away</p>
<p>Man, how is it that you guys think this is hard and Math II was easy? The Math II always kicks my *** (I consider skipping 6 an *** kicking, plus I did a lot of guessing) I guess it’s all about having a good teacher.</p>
<p>Well the physics was a bit harder than i expected this time, so i have to agree with the dudes above. Hopefully though, if we all thought it was hard, that wont affect our score since this could apply to most of the test-takers and re-adjust the entire scale. That would mean that we could get one or two more wrong to get the same score than usual. It is also quite interesting because the other two science tests (bio and chem) have relatively dead curves (-4 means no 800) but physics (according to above) is nearly -10 and still 800. Hopefully that applies this year too</p>
<p>I found this (and Math II by extension) were nice, but tricky exams. It was easy to trip (and I’m sure I did several times). Anyone knows what the curve looks like in the 50 region for physics? and 30 region for math?</p>
It is also quite interesting because the other two science tests (bio and chem) have relatively dead curves (-4 means no 800) but physics (according to above) is nearly -10 and still 800. Hopefully that applies this year too</p>