<p>I was so time pressed.
I was on 65 and I hear: 5 minutes left!! Then i start to panic and speed through. i got lucky and finished fast, but I’m somewhat sure i got 2 of those 10 wrong. </p>
<p>I left 2 blank and guessed on a few. I’m expecting a borderline 800. </p>
<p>2 more hours till we can discuss…</p>
<p>I thought the test was pretty easy, I was good on time but didn’t have enough to check all of my answers. I left 2 blank and probably got ~7 wrong, hoping for an 800.</p>
<p>The other threads have started discussion, so I’m guessing that the embargo has been lifted. What were your answers for the two questions about the metal rods and whether they were magnets?</p>
<p>I randomly put A and A, no idea though.</p>
<p>I have a list that I made and went over with a friend. Feel free to argue. </p>
<p>v/2L is fundamental frequency for string fastened at two ends
Resonance was an answer
For the graph given about a wave: period = 0.01s
amplitude = 4
wavelength = 6
For the graph given about potential energy versus distance:
potential energy at x1 = a
kinetic energy at x1 = b
75) R isnt necessary for emf
beta particle emission question: nuclear mass stays the same
radioactive decay with half lives after 90 days = 8
Telephone messages —> visual images on screen = cathode rays (not fiber optic cables) [Cathode</a> ray tube - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Cathode_ray_tube]Cathode”>Cathode-ray tube - Wikipedia) and [Optical</a> fiber - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Optical_fiber]Optical”>Optical fiber - Wikipedia)
students record distance travelled: predict 13.4m in fifth second (<strong>not too sure)
two magnets are next to eachother:
1st question: either one or both are permanent.
2nd question: both are permanent
Q = cv = 20x10^6
for 73) current is same (E) I1 = I2 = I3 (current stays same in series circuit)
for 74) use resistance eqn. answer was D/E cant remember (r2, < ,r1 = r3)
for the beginning like 6-8 given graphs:
relationship between mass and energy = E = mc^2 = straight line (B)
relationship between freq. and energy = E=hf = straight line (B)
intensity of monochromatic blue light ( D which is straight line with positive x intercept) (</strong>*not sure)
the beam refracts at less than 30 degrees
optics question with converging lens: same size upside down
for 72) f/cos thetha
71) F = 40 N
First few questions:
1) momentum of II is greater
2) momentum is same
3) momentum is same
optics question with plane mirror at an angle: image is virtual and not inverted
Least affects static shock when getting out of car: whether the engine is on
Pulley with 2 masses of 50 N each and in equilibrium: Force on the rope is 50 N</p>
<p>overall reaction: somewhat difficult test - time pressured</p>
<p>
Was that choice E?
Also why is “whether the engine is on” the answer?</p>
<p>
I think it was D.
I used process of elimination but I wasn’t too sure.
Humidity was another choice. I thought the engine wouldn’t make a difference to the car or the electrons.</p>
<p>@hotinpursuit</p>
<p>I agree with all the answers except 74), I remember it being something like r2 < r1 < r3 or something like that, but none of them were equal.</p>
<p>
YESSSSS that just made my day</p>
<p>and for 74, r1 and r3 were exactly the same length and same cross sectional area.(r2 had larger cross sectional area) How could the resistances r1 and r3 be different? R = PL/A</p>
<p>Care to explain that? I might just be missing something.</p>
<p>I agree with evillion. r1 and r3 had different cross sectional areas.</p>
<p>the other 2 were not the same size, r3 was smaller than r1</p>
<p>I remember seeing that they were all the same length, but they all varied in width (middle one with thickest, one on right was thinnest, one on left was medium). Therefore, none of them could equal each other.</p>
<p>“students record distance travelled: predict 13.4m in fifth second (**not too sure)”</p>
<p>the answer was average speed was 10.77 for t=3-4 or sumthing like that</p>
<p>yes that is true, i put that too</p>
<p>Ohh okay. I guess I misread the picture. I was zooming through the last 10 problems so that makes sense.
And is the engine answer right?</p>
<h2>Consolidated List</h2>
<p>v/2L is fundamental frequency for string fastened at two ends
Resonance was an answer
For the graph given about a wave:
period = 0.01s
amplitude = 4
wavelength = 6
For the graph given about potential energy versus distance:
potential energy at x1 = a
kinetic energy at x1 = b
75) B0 or R isnt necessary for emf <strong>(split)
beta particle emission question: nuclear mass stays the same
radioactive decay with half lives after 90 days = 8
Telephone messages —> visual images on screen = cathode rays / fiber optic cables (<em>split)
students record distance travelled: 10.77 is average velocity / 13.4 m in fifth second (</em>split)
two magnets are next to eachother:
1st question: either one or both are permanent.
2nd question: both are permanent
Q = cv = 20x10^6
for 73) current is same (E) I1 = I2 = I3 (current stays same in series circuit)
for 74) use resistance eqn. R = PL/A answer was r3<r1<r2
for the beginning like 6-8 given graphs:
relationship between mass and energy = E = mc^2 = straight line (B)
relationship between freq. and energy = E=hf = straight line (B)
intensity of monochromatic blue light ( D which is straight line with positive x intercept) (</strong>*not sure)
the beam refracts at less than 30 degrees
optics question with converging lens: same size upside down
for 72) f/cos thetha
71) F = 40 N
First few questions:
<p>overall reaction: somewhat difficult test - time pressured</p>
<p>“Telephone messages —> visual images on screen = cathode rays (not fiber optic cables)”</p>
<p>wrong: “Modern cables come in a wide variety of sheathings and armor, designed for applications such as direct burial in trenches, high voltage isolation, dual use as power lines,[44][not in citation given] installation in conduit, lashing to aerial TELEPHONE POLES”</p>
<p>fiber optics uses total internal reflection of light to carry phone messages at the speed of light to recievers</p>
<p>Yup the engine answer is right. Can’t really think of many to add atm (took physics first so its the most hazy), but I do remember:
-> The efficiency one being 40%
-> B for the field line diagrams w/ two opposite charges
-> 30m for dropping something off a cliff (or maybe 80m? kinda uncertain)
-> “II only” for the one with large and small boxes with temperature transfer</p>
<p>Ill keep posting as I remember them</p>
<p>I need confirmation and explanation on 2 questions: </p>
<p>Least affects static shock when getting out of car: whether the engine is on</p>
<p>and </p>
<p>intensity of monochromatic blue light ( D which is straight line with positive x intercept) (***not sure)</p>
<p>i put fiber optic cables. i’m pretty sure thats right. cathode rays don’t have anything to do with transmitting telephone messages.
and the engine answer is also correct. I didn’t see that one right away, but i realized that it was talking about the static shock, after you rub yourself on the seat as you get out of the car and then touch the car. it was a pretty bad question, but the answer is whether the engine is on/off.</p>
<p>evillion I got all 4 same (30m) !!!</p>
<p>Alright thank god there’s a -15 or so curve</p>