<p>^^Xanadrin: That is the curve in the Blue Book, and many say it is way too lenient. </p>
<p>^PioneerJones, could it also be Resonance then:Resonance is a condition that exists when the frequency of a force applied to a system matches the natural frequency of vibration of the system? I’m crossing fingers for beats, but fundamental frequency sounds pretty spot on.</p>
<p>It’s actually most likely resonance, now that you mention it. I may have confused fundamental frequency with natural frequency while taking the test. I can’t remember which I picked. I’m about 90% confident that it’s resonance.</p>
<p>Acoustic resonance basically means that an object is more likely to vibrate at certain frequencies than others. That seems like the answer we’re looking for.</p>
<p>ya, i think there must be some mechanism or something in the speaker that will vibrate when the pitch is close to its natural frequency.
i am also pretty sure its resonance.</p>
<p>For the parallel plate question it asked about comparing the forces on three particles at different locations between the plates. I believe the answer was that the forces were the same at all locations because F=qE and V=ED so no matter where you put the charges between the two, the force should be the same. I can’t remember the other question that went with that diagram though.</p>
<p>^There were 5 particles I believe and one of the questions asked which had the greatest PE and it was the one closest to the positive part of the capacitor plate, since the Fe flows from positive to negative.</p>
<p>Here’s the updates list. I’m at -5 with 7 or 8 omits :(</p>
<ol>
<li>Universe expansion: red shift + something else, I & II</li>
<li>Oil drop: calculate electron charge</li>
<li>Ice cube -50 C to 150 C:
… <em>/
… /
.</em>/
/</li>
<li>Initial velocity 30 m/s, v and a at apex: 0 m/s, -10 m/s^2</li>
<li>Initial velocity 30 m/s, v and a final: 30 m/s, -10 m/s^2</li>
<li>X and Y collision: need to know masses (was this the same as ratio of the masses?)</li>
<li>Thermal equilibrium: increase entropy</li>
<li>Insulator/conductor: glass and aluminum</li>
<li>Starting a fire: converging lens</li>
<li>Cop car moving: fA < f0, fB > f0</li>
<li>People moving: fA > f0, fB < f0</li>
<li>Heavy ball versus lighter ball: I put ratio of V to SA was smaller in the larger ball</li>
<li>Lightest particle: electron (I just googled this)</li>
<li>Magnification of diameter of coin: 6 (choice A)</li>
<li>Ball going east, force applied to it: went east, curved, and carried on this way diagonally southwest</li>
<li>Why doesn’t moon crash into earth: Constant gravitational pull, but the velocity keeps it from crashing</li>
<li>Electroscope, what was the rod’s charge: negative</li>
<li>Which one didn’t have a 1/r^2 graph: potential energy of charge</li>
<li>Maximize magnetic force: I, II, and III (velocity of particle, charge of particle and magnitude of magnetic field)</li>
<li>Moon and earth gravity, change in mass: no change </li>
<li>Moon and earth gravity, change in force: 160 N</li>
<li>20 ohm and 40 ohm resistor: h/2</li>
<li>Changing induced current: I, II, and III (area, resistance, rate of change of field)</li>
<li>Charge and circle, change in potential: I and II</li>
<li>Charge and circle, MAX change in potential: I</li>
<li>Charge and circle, no work: III</li>
<li>Two samples: 50 degrees C</li>
<li>Buzzing noise: Resonance</li>
<li>P/V graph for heat engine: II and III</li>
<li>Normal force: cart on the bottom (point A)</li>
<li>Scientist: Galileo</li>
<li>2m and 3m carts: tension is 2m</li>
<li>Greatest acceleration for pendulum: at the greatest displacement </li>
<li>Greatest tension on swing: at the bottom</li>
<li>Index of refraction: ???</li>
<li>Set of numbers, accelerating: 1, 4, 9, 16</li>
<li>Set of numbers, force opposing velocity: numbers decreasing</li>
<li>Set of numbers, K.E. of sliding block: 1, 4, 9, 16</li>
<li>Inelastic collision: linear momentum conserved</li>
<li>Guitar string: wavelength only</li>
<li>Charge with highest potential: the one that was farthest up</li>
<li>Which refraction/reflection line is incorrect: the one at the bottom going through the glass out into the air (choice E)</li>
<li>Double earth radius, effect on gravity: g/4</li>
<li>Change in pendulum period due to change in gravity: 1st planet would be sqrt(2)*T and in the second T/sqrt(2)</li>
<li>Stretched spring = 2d, new velocity: 2v</li>
<li>Frequency of beats: just subtract the 2 frequencies</li>
<li>Impossible standing wave: the one that was impossible was the one where the nodes and antinodes were not in their places</li>
<li>Rocket and earth relativistic speeds: Earth’s time is longer</li>
<li>31 atomic mass: 16 protons and 16 electrons</li>
<li>Slit experiment: there are dark and light intervals because light interferes with other light rays coming from different parts of the slit</li>
<li>Heat engine: 110 J</li>
<li>Free body diagram:
………N
………↑__
FR←l__↘l
…………↓….F
…………mg</li>
<li>Was there also a question where they gave you the wavelength of light and you had to calculate the frequency? 210^8 Hz (Was this on the test? I don’t remember this question.)</li>
<li>Skewed elliptical orbit: angular momentum is conserved (III only)</li>
<li>Calculate internal heat: II and III only (specific heat and mass)</li>
<li>Force vs. Time graph, find impulse by calculating area underneath: 10</li>
<li>KE vs. time: none are constant</li>
<li>KE vs. time, when is velocity = 0: when graph intersects x-axis</li>
<li>KE vs. time, when is velocity constant: when the graph is flat</li>
<li>Election through magnetic field, force = 0: when electron was moving parallel to the field</li>
<li>Election through magnetic field, force going upward: electron moving left, field pointing out of page</li>
<li>Three of these make up something in the nucleus: quarks, 3 quarks make a proton</li>
<li>Number of electrons/second in 1.6 A current: 110^19</li>
<li>Angle to maximize magnetic force: 90 degrees</li>
<li>Convection: I remember the answer being the only one with gases and liquids mentioned in it? Can anyone confirm?</li>
<li>Proton in middle of two particles, charge of two particles: both negative</li>
<li>Parallel plates: all have same charge</li>
</ol>
<p>Compiled Answers
-Universe expansion: red shift + something else, I & II
-Oil drop: calculate multiples of electron charge
-Ice cube -50 C to 150 C:
… <strong>/
… /
./
/
-Initial velocity 30 m/s, v and a at apex: 0 m/s, -10 m/s^2
-Initial velocity 30 m/s, v and a final: 30 m/s, -10 m/s^2
-X and Y collision: need to know masses (was this the same as ratio of the masses?)
-Thermal equilibrium: increase entropy
-Insulator/conductor: glass and aluminum
-Starting a fire: converging lens
-Cop car moving: fA < f0, fB > f0
-People moving: fA > f0, fB < f0
-Heavy ball versus lighter ball: I put ratio of V to SA was smaller in the larger ball
-Lightest particle: electron (I just googled this)
-Magnification of diameter of coin: 6 (choice A)
-Ball going east, force applied to it: went east, curved, and carried on this way diagonally southwest
-Why doesnt moon crash into earth: Constant gravitational pull, but the velocity keeps it from crashing
-Electroscope, what was the rods charge: negative
-Which one didnt have a 1/r^2 graph: potential energy of charge
-Maximize magnetic force: I, II, and III (velocity of particle, charge of particle and magnitude of magnetic field)
-Moon and earth gravity, change in mass: no change (arghhhh I got tricked T.T)
-Moon and earth gravity, change in force: 160 N
-20 ohm and 40 ohm resistor: h/2
-Changing induced current: I, II, and III (area, resistance, rate of change of field)
-Charge and circle, change in potential: I and II
-Charge and circle, MAX change in potential: I
-Charge and circle, no work: III
-Two samples: 50 degrees C
-Buzzing noise: resonance
-P/V graph for heat engine: II and III
-Normal force: cart on the bottom (point A)
-Scientist: Galileo
-Graph of K.E., which of these is 0: none of these
-2m and 3m carts: tension is 2m
-Greatest normal force on cart: at bottom
-Greatest acceleration for pendulum: at the greatest displacement (missed this one )
-Greatest tension on swing: at the bottom
-Index of refraction: ???
-Set of numbers, accelerating: 1, 4, 9, 16
-Set of numbers, force opposing velocity: numbers decreasing
-Set of numbers, K.E. of sliding block: 1, 4, 9, 16
-Inelastic collision: linear momentum conserved
-Guitar string: wavelength only
-PARALLEL PLATES, Charge with highest potential: the one that was farthest up
-Which refraction/reflection line is incorrect: the one at the bottom going through the glass out into the air (choice E)
-Double earth radius, effect on gravity: g/4
-Change in pendulum period due to change in gravity: 1st planet would be sqrt(2)*T and in the second T/sqrt(2)
-Stretched spring = 2d, new velocity: 2v
-Frequency of beats: just subtract the 2 frequencies
-Impossible standing wave: the one that was impossible was the one where the nodes and antinodes were not in their places
-Rocket and earth relativistic speeds: Earths time is longer
-31 atomic mass: 16 protons and 16 electrons
-Slit experiment: there are dark and light intervals because light interferes with other light rays coming from different parts of the slit
-Heat engine: 110 J
-Free body diagram:
…N
…↑</strong>
FR←l__↘l
…↓
.F
…mg
-Was there also a question where they gave you the wavelength of light and you had to calculate the frequency? 2<em>10^8 Hz (Was this on the test? I dont remember this question.)
-Skewed elliptical orbit: angular momentum is conserved (III only)
-Calculate internal heat: II and III only (specific heat and mass)
-Force vs. Time graph, find impulse by calculating area underneath: 10
-KE vs. time: none are constant
-KE vs. time, when is velocity = 0: when graph intersects x-axis
-KE vs. time, when is velocity constant: when the graph is flat
-Election through magnetic field, force = 0: when electron was moving parallel to the field
-Election through magnetic field, force going upward: electron moving left, field pointing out of page
-Three of these make up something in the nucleus: quarks, 3 quarks make a proton
-Number of electrons/second in 1.6 A current: 1</em>10^19
-Angle to maximize magnetic force: 90 degrees
-Convection: I remember the answer being the only one with gases and liquids mentioned in it? Can anyone confirm?
-Proton in middle of two particles, charge of two particles: both negative
-For the parallel plate question it asked about comparing the forces on three particles at different locations between the plates. I believe the answer was that the forces were the same at all locations because F=qE and V=ED so no matter where you put the charges between the two, the force should be the same. I can’t remember the other question that went with that diagram though.
There were 5 particles I believe and one of the questions asked which had the greatest PE and it was the one closest to the positive part of the capacitor plate, since the Fe flows from positive to negative. Are these the same question? I think there were 2 questions over that same diagram or something. One was like whats the greatest potential, and the other was like calculate the force? I dont remember.
-Not property of sound: polarization
-Velocity of the (car) in the middle of the time interval: zero
-Cars displacement: zero ***I think I put zero too, but arent you supposed to calculate the area under the curve? And in that case, wouldnt it be some positive number? Although I doubt something like calculating the area under a parabola was on the SAT since that requires calculus.
Total: 70 (2 of which are still unanswered)
Read through ALL of these (some of the earlier ones may have been changed) and see if you guys agree. Just 5 more, you guys!</p>
<p>I really don’t remember a parallel plates question asking which had the greatest force…was that the same as the greatest potential?</p>
<p>And lol nevermind about the car one.</p>
<p>^for the car’s displacement u are not supposed to calculate the area under the curve, since it was a time vs. displacement graph and not a velocity vs. time one. Does any1 remember if there was a question abut dilatation, or if the only question regarding to ideal gases was teh one with the graph? I thought there were two. And for the convection one, I remember very clearly the answer had the word “fan” on it. I remember it because thats exactly the example sparknotes uses to explain convection.</p>
<p>@jimei1337 Was the question of the period of the pendulum in 2 different planets just one or was it split in two? If it was split in two, then we have 71 questions.</p>
<p>^No, the pendulum one was just one question.</p>
<p>You might be right about the fan one. I remember being really rushed for time, and just skimming the answers without really reading them…but I would’ve thought an answer choice with gases and liquids in it would’ve been correct, and I doubt we’re talking a bout the same answer here. Does anyone else remember what they put for the convection one? You’re probably right, but I guess this is just wishful thinking on my part, since missing another question means I’ll get penalized another point :(</p>
<p>can anybody remember the wording for the convection question?
I don’t remember it at all so I think I may have skipped an entire page or else bubbled in something else for the convection question, shifting all my answers?</p>
<p>I don’t remember the convection one.</p>
<p>^Me neither</p>
<p>Neither do I. I don’t believe there was one.</p>
<p>Are you sure? I could’ve sworn there was one. I specifically remember thinking on that question, “Oh it’s so wordy” and rushing through it.</p>
<p>Maybe you guys don’t remember anymore because it’s been 3 days, and also because it probably wasn’t a very tricky question, straight recall.</p>
<p>I think the question was just like, which of these is an example of convection?</p>
<p>^Yes, it asked about an example.</p>
<p>what were the examples?</p>
<p>I remember it being really easy and straightforward. Besides that, I can’t say.</p>
<p>I don’t remember a convection question either.</p>