<p>Ok, thanks. Does anyone remember the question where some particle had an instantaneous velocity of v=10 in the x direction, and it was like which of the following could you conclude about it? the “instantaneous” phrasing confused me a bit.</p>
<p>also, if anyone can remember more questions, that would be great!</p>
<p>2400student: No conclusion.</p>
<p>Also, “Which of the above graphs represent a physical quantity by the area under the graph?”</p>
<p>The graph on top right was Force vs String Extension.</p>
<p>F * l = Work</p>
<p>So I put that too. There was an option where it said the vt graph and the force/string extension graph, I put that one.</p>
<p>And I did the same for the spaceship. :D</p>
<p>oh that’s quite relieving!</p>
<p>I’ve also got a couple more questions.</p>
<p>there was a question with a graph that measured pressure with respect to volume of a gas. There were two curves, the lower one being cold temperature, and the higher one being hot temperature. there were 3 transitions represented by arrows, and it asked which one had increased in KE. I put 1 only, the one where V is the same, but the temp goes from cold to hot.</p>
<p>Also, what was the answer to the question about the photoelectric effect?</p>
<p>There was also another question about a negatively charged rod that was brought close to two adjacent spheres, and it asked for the charge of the spheres after it’s brought away, i was sort of confused about that.</p>
<p>“there was a question with a graph that measured pressure with respect to volume of a gas. There were two curves, the lower one being cold temperature, and the higher one being hot temperature. there were 3 transitions represented by arrows, and it asked which one had increased in KE. I put 1 only, the one where V is the same, but the temp goes from cold to hot.”</p>
<p>I did the same.</p>
<p>Photoelectric effect proved particle like nature of light.</p>
<p>And the sphere on the left got positively charged and the one on the right got negatively charged. (This is a question from one of the examples of NCERT Physics Class XII, my textbook.)</p>
<p>but, if the spheres are oppositely charged, wouldn’t they stay next to each other, instead of separating?</p>
<p>also, a few more questions i remember.</p>
<p>There was a ball or something moving in circular motion, attached to a string, pivoted at the center of the circle. It was the last question I think. It looked as if the ball was going in a circle vertically with the influence of gravity, and it asked for the point where tension in the string was greatest. I got the acceleration vector, but I’m not so sure about Tension.</p>
<p>Btw, do you remember any other questions? I thought I did pretty well, maybe 5 wrong, but there are many questions i just breezed through, and I’m so paranoid I missed a lot of those ><</p>
<p>Acceleration vector was the one pointing left and slightly down. Left because in circular motion acceleration is perpendicular to the velocity and slightly down due to effect of gravity.</p>
<p>The tension is highest at the lowest point in the circle.</p>
<p>Here is how the rod thingy works:</p>
<p><a href=“http://i.imgur.com/nQsAZ.png[/url]”>http://i.imgur.com/nQsAZ.png</a></p>
<p>WARNING: My drawing sucks. May cause permanent brain damage. Proceed at own risk.</p>
<p>Agh, I was thinking of torque for that question for some strange reason >< Anyways.</p>
<p>thanks for the drawing xD</p>
<p>There was one question about the Bohr model and it asked how many of the 3 points were true. I put that all three points were, but I think the 3rd point said that energy is emitted when an electron goes to a higher energy level. I think they made the wording a little tricky, cause I think it’s supposed to go the other way.</p>
<p>The third part is NOT true.</p>
<p>It said something like: Visible light is emitted when electron goes from lower energy to higher energy.</p>
<p>This is wrong for two reasons. </p>
<p>First, when electron “goes from lower energy to higher energy” it had to absorb electromagnetic radiation. NOT emit.</p>
<p>And the radiation is not always in the visible spectrum.</p>
<p>Rohit, it wasn’t phrased like that, but it meant the same as you said. It was phrased more like 2400StudentNOT said, but not completely. I will probably not have better raw score than 55/75 since I skipped 10 questions and I have at least 5 wrong answers. This would give me 750, but I think I would be fine with 720 or higher as well.</p>
<p>Yeah, I had a feeling it should had been absorbed. But it was in the last minute, so I just put all of them. Do you remember another question about the light spectrum? I seem to remember something like that, but I don’t remember exactly what the question was.</p>
<p>Oh, there was also the question with the two blocks, and it asked which tools were necessary to determine acceleration. There was a stopwatch, a meterstick, and a balance. What was the answer to that one?</p>
<p>Not sure about that but I said just the balance.</p>
<p>Don’t remember any other spectrum related questions, sorry.</p>
<p>And, yes the phrasing might be wrong but I am sure that it was not a correct option…</p>
<p>^^^ I said everything but the balance, because all that you have to do is find out change in velocity over change in time and since v=d/t (technically this is speed but we are only worried about the magnitude of the velocity) we need something to measure distance(meter stick) and something to measure time(stopwatch)</p>
<p>For the spaceship question I put that the probe velocity relative to the earth was-
.6c < V < c because you cant ever go faster than the speed of light but it had to be going faster than the speed of the spaceship which was .6c. Right?</p>
<p>Overall I thought this was the easiest of the three tests I took, Math IIC, Chemistry, and Physics.</p>
<p>.7 < v < c
But yes, faster than space ship and slower than speed of light I think.</p>
<p>I put “.7 < v < c” as well.</p>
<p>I said balance because,</p>
<p>(Actual weight-Apparent weight)/10 = acceleration.</p>
<p>Is it wrong?</p>
<p>Lol I managed to list all the questions I remember, and I happen to recall 70 of the questions >< I really need a 750+ or I’m going to cancel the score this Wednesday…</p>
<p>Here are the ones I’m not sure of, or I don’t recall very well.</p>
<p>The first 3 questions, with 3 diagrams, two with a Force, and opposing friction, and one in circular motion. It asked something like which diagram has net force in the same direction as velocity, opposite direction, or perpendicular. I said there was one for each.</p>
<p>A few questions after, there is a block at the base of a ramp with initial velocity v, and it asks for the graphs of net force vs. time, velocity vs. time, and total energy vs. time. I said Net force is constant, velocity decreases linearly, and then increases linearly, and total energy is constant.</p>
<p>There was another question where it gave you a charge of a particle and the electric field, then it asked for the direction of the force. I said it was going south, the same direction as the electric field</p>
<p>Another question showed a picture with 3 mediums, and it asked what would make the entrance angle of the light ray and the exit angle the same. I said that the index of refraction for mediums 1 and 3 had to be the same</p>
<p>There’s a couple more, but I don’t want to flood this discussion (although I already have ><)</p>
<p>I think balance is correct, but it may still be wrong, cause I don’t remember the exact conditions of the question…</p>
<p>“The first 3 questions, with 3 diagrams, two with a Force, and opposing friction, and one in circular motion. It asked something like which diagram has net force in the same direction as velocity, opposite direction, or perpendicular. I said there was one for each.”</p>
<p>Fig A: Circular motion, velocity and acceleration are perpendicular</p>
<p>Fig B: Net Force is in same direction as that of the velocity</p>
<p>Fig C: Net Force is in opposite direction as that of the velocity</p>
<p>“A few questions after, there is a block at the base of a ramp with initial velocity v, and it asks for the graphs of net force vs. time, velocity vs. time, and total energy vs. time. I said Net force is constant, velocity decreases linearly, and then increases linearly, and total energy is constant.”</p>
<p>Right in all.</p>
<p>“There was another question where it gave you a charge of a particle and the electric field, then it asked for the direction of the force. I said it was going south, the same direction as the electric field”</p>
<p>I think the charge was negative? I don’t really remember. But if it was negative it will move opposite to the direction of the field.</p>
<p>“Another question showed a picture with 3 mediums, and it asked what would make the entrance angle of the light ray and the exit angle the same. I said that the index of refraction for mediums 1 and 3 had to be the same”</p>
<p>No. The refractive index for medium 1 and 3 had to be same. But 1 and 3 ALSO had to be parallel. Both of these together we not an option. So I tick the E part, it said something like No Answer.</p>
<p>“There’s a couple more, but I don’t want to flood this discussion (although I already have ><)”</p>
<p>Flood away, at least that way I can remember too.</p>
<p>alrighty then xD</p>
<p>there were two elliptical orbit questions i think, one asked for the point where an orbiter’s velocity was greatest, which I said was at the point closest to the object it was orbiting. Another question asked for a graph of acceleration from point A to B, where A was the point furthest away, and B was the point closest. I chose the graph that increased in a curve.</p>
<p>Another answer was to move one of the charges 2 to the right.</p>
<p>an object is dropped, and it is also fired horizontally. they both have same acceleration.</p>
<p>there was some question that asked for the definition of efficiency rate? something like that, woudl you happen to remember?</p>
<p>two particles, one traveling in negative y direction, the other in positive x direction, and i think they collide at the origin. the particle that was originally going in the negative y direction ends up going in the positive x direction with a much greater speed. I said that the other particle goes in the positive x direction, and negative y direction</p>
<p>There’s 1kg of bricks, and 1kg of feathers. It asks which of the following is the same for both. I said mass only. there was something with number of molecules, but i think that’s wrong.</p>
<p>Light bulb question, 60 W 120 V for 100 seconds. I said heat dissipated was 6000J and resistance 240 ohms</p>
<p>Vehicle traveling at velocity V. breaks, and skids distance d. When it’s going at velocity 3v, what’s the distance it skids? I put 3d but i’m sure i’m wrong.</p>
<p>All the other questions I’m sure about, and there’s another 5 I can’t remember. Agh, but thanks so much, Mr. Answer Key xD</p>
<p>“there were two elliptical orbit questions i think, one asked for the point where an orbiter’s velocity was greatest, which I said was at the point closest to the object it was orbiting.” </p>
<p>Correct. In an elliptical orbit equal amounts of area are sweeped out in equal time, one of Kepler’s laws. So when it is close by it needs to move faster so as to cover a relatively larger area.</p>
<p>“Another question asked for a graph of acceleration from point A to B, where A was the point furthest away, and B was the point closest. I chose the graph that increased in a curve.”</p>
<p>Don’t remember. Elaborate?</p>
<p>“Another answer was to move one of the charges 2 to the right.”</p>
<p>I remember it. I think I moved it to right too. (by 2 cm?)</p>
<p>“an object is dropped, and it is also fired horizontally. they both have same acceleration.”</p>
<p>Right.</p>
<p>“there was some question that asked for the definition of efficiency rate? something like that, woudl you happen to remember?”</p>
<p>Don’t remember.</p>
<p>“two particles, one traveling in negative y direction, the other in positive x direction, and i think they collide at the origin. the particle that was originally going in the negative y direction ends up going in the positive x direction with a much greater speed. I said that the other particle goes in the positive x direction, and negative y direction”</p>
<p>Correct.</p>
<p>“There’s 1kg of bricks, and 1kg of feathers. It asks which of the following is the same for both. I said mass only. there was something with number of molecules, but i think that’s wrong.”</p>
<p>Correct. </p>
<p>The option was “Weight” not “mass” (as far as I remember). And yes, number of molecules was not right.</p>
<p>“Light bulb question, 60 W 120 V for 100 seconds. I said heat dissipated was 6000J and resistance 240 ohms”</p>
<p>Correct.</p>
<p>“Vehicle traveling at velocity V. breaks, and skids distance d. When it’s going at velocity 3v, what’s the distance it skids? I put 3d but i’m sure i’m wrong.”</p>
<p>v^2 - u^2 = 2as</p>
<p>v = 0 (skids to a stop)</p>
<p>u^2 = -2as</p>
<p>but a is negative and constant</p>
<p>s is directly proportional to square of velocity.</p>
<p>Ans: 9d</p>
<p>"All the other questions I’m sure about, and there’s another 5 I can’t remember. Agh, but thanks so much, Mr. Answer Key xD "</p>
<p>No problem. :)</p>
![http://i.imgur.com/nQsAZ.png[/url]](http://i.imgur.com/nQsAZ.png%5B/url%5D){kind=link}
