<p>How was it. Let's discuss.</p>
<p>What was the merry go round one?</p>
<p>What was the one with the energy related and the options were Solid Liquid and Gas?</p>
<p>That was the question about which of those mediums could transmit energy. I chose E, all of them.</p>
<p>280N for merry go round (mv^2/r = 70; m(2v)^2/r = 4mv^/r = 70 * 4 = 280). Too bad I thought of this right after the test...</p>
<p>I chose E, all of the above for which mediums waves could travel in as well.</p>
<p>Anyone remember the one about the pulse being shot at to the end of a string and how it would come back (something about same velocity, inverted or not inverted, etc.)? Also, one about the two parallel capacitors with a conductor touching one of them?</p>
<p>Good, thats exactly what I put for both.</p>
<p>For the pulse question, I said it would rebound inverted because its pretty logical and I saw my teacher do the experiment before.</p>
<p>I agree for all.</p>
<p>And what about the planet ones with gravity?
adnadnandandand the prism light waves?</p>
<p>i don't mean to double post but why is the physics thread so unpopular?
Where are all you guys?!?</p>
<p>Oh, and any guesses on curve? :}</p>
<p>Probably a standard curve: -15 raw = 800.</p>
<p>Hahah it's so sad how this thread hasn't even made it to the second page and all the other threads have gone like 5+ pages!</p>
<p>no one likey physics? ): i was surrounded by kids taking math iic. and it was so sad, right before the test, this random guy goes around asking everyone "does anyone have an extra calculator?!" you can tell he definitely prepped hard -______________-;;</p>
<p>Hey guys, what about the ball being thrown from 20m up at a velocity of 5m/s?</p>
<p>Yup, agree with you guys on the wave medium, merry-go-round, and pulse (inverted and also speed was the same).</p>
<p>Prism one was the one about what happens to light (both refraction and reflection) right? For refraction I put the ray would go down, and for reflection I put the higher ray on the left side of the prism (cause incidence angle = reflection angle).</p>
<p>Btw what did you guys put for the first question sound wave in two tubes (wavelength question). I didn't know it so I omitted it, but would like to know the answer :)</p>
<p>It was a little bit easier than the practice tests I failed before. Omitted 12.</p>
<p>I wouldn't suck so much at physics if I actually had to do stuff in that class. We haven't had any homework or a test the whole year...</p>
<p>About the tube question, I am not a hundred percent sure, but here is what I think. Once the loudspeaker emits sound down the tube, that wave divides into two directions where one half goes through the left and the other half to the right. But the question said that the left side has an extra 10 meters that the wave has to travel through, and the sound that comes out the other end is suppressed. I thought that was an example of destructive interference where because the left side had an extra 10m of length, it threw the left and right wave off, and when they met again, they were not in phase, resulting in the suppressed sound. So if they were out of phase, and the left side had an extra 10m, I put that the wavelength was 20 meters. What do other people think?</p>
<p>I think that it was 20 meters too for the loudspeaker one, but not really sure. I omitted it. </p>
<p>For the prism one, was the incident ray from the top or was it the middle normal one? For some reason, i thought that the light ray struck the prism in the middle... =|</p>
<p>uhmmmmmmm what else was there...
what about the two planets and which one was greatest gravitational force and the least?</p>
<p>Yea. I put 20 meters for hte wavelength. What about the second part? Was it intensity.</p>
<p>The prism one had the incident ray in the middle - it was the only one without a letter on it.</p>
<p>For the second tube question I also put intensity. I didn't really understand that question initially, but I assumed that wavelength wouldn't change. The material also didn't become denser I think, so the velocity and frequency would be constant. I'm still not exactly sure, but I answered intensity as I remembered it was something like power per area (and the area increased?).</p>
<p>When they changed the first side, they said intensity changed, so I assumed that it would change again if the tube was pulled again.</p>
<p>Alright, that seems reasonable. I hope that's the right answer. That question was really strange to me (hadn't seen it before in both the SAT book and physics class). I guess it was more of an application question.</p>
<p>Anyways I'm off to bed, it's already 2 am here in Malaysia. Cheers.</p>
<p>So if the incident ray was in the middle, then which one was the reflected ray? because isn't the reflected ray supposed to be at the same angle...</p>