<p>Also, for our scores, even if we selected the paper delivery option, can we still see them online on February 10th?</p>
<p>Compiled Answers
-Universe expansion: red shift + something else, I & II
-Oil drop: calculate electron charge
-Ice cube -50 C to 150 C:
… _<em>/
… /
.</em>/
/
-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?)</p>
<p>@schoolisfun, I’m pretty sure you’ll see them online</p>
<p>it just said that X and Y weren’t necessarily the same. nothing about one being greater than the other.</p>
<p>I remember there being a question of which is a good insulator and a conductor. I was confused between D) Glass and Silk and E) Glass and Al.
I think it is D
I don’t remember what i put…</p>
<p>Another one I didn’t answer was what kind of lens a girl was using to light a flame on paper.</p>
<p>I think there was also one about a cop car moving to the right. fA < f0, fB > f0
and when both people move to the right: fB < f0, fA > f0.
@MCS735 it was a converging lens.
@roshanmandal i think it was E, cuz metals are known for being good conductors. not sure about silk.</p>
<p>^I put I only (convex converging lens)</p>
<p>for insulator/conductor, i put glass and al, but I don’t remember it being choice E. I remember that as choice D.</p>
<p>i have lotsa questions. i thought the test west pretty hard.
first, i think there was one problem about a heavier ball and a lighter ball…and the heavier ball having gone further(?) after some time.
2. is the lightest particle a quark?
3. then what was the answer for the next one question (after the light particle question)
4. what about the problem about a particle with charge 3 microocoloumbs…100V, and distance=10cm between two plates…
5. anyone know the answer with the lens with index of refraction=1.5…and water =1.33…
6. last, what about the…question about the rod? the choices were like…negative/positive, neutral and grounded…etc</p>
<ol>
<li>i put the lightest particle with NONZERO mass was the electron. </li>
<li>I put negatively charged. </li>
</ol>
<p>not sure about my answers though</p>
<p>For conservation of momentum, the equation Xv1=Yv2 is what you would use. From this, you can determine you need to know the ration of their masses to know v1/v2.</p>
<p>Compiled Answers
-Universe expansion: red shift + something else, I & II
-Oil drop: calculate electron charge
-Ice cube -50 C to 150 C:
… _<em>/
… /
.</em>/
/
-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?)
-Insulator/conductor: glass and aluminum
-Starting a fire: converging lens
-Cop car moving: fA < f0, fB > f0
-People moving: fA > f0, fB < f0</p>
<p>for your 2nd question i put electron. I have no idea what a quark is.</p>
<p>Some other questions</p>
<p>the last one: THere was a ball going east. After a while, a force was put directed at the center. After some time, the center-force was removed. What was the trajectory of the ball.
I put E: it went east, then curved, and then moved at a tangent.</p>
<p>In part A, the second or third question regarind Doppler Effect: What happens to the freq when the car stays at one spot but the two people (A and B) move to the right?</p>
<p>Another question: Why is there a buzzing noise? (I am not exactly sure what the question was…) The answer options had “resonance” “diffraction” etc.</p>
<p>Question: There was something regarding current and time in a wire. I put 1 X 10^-9 (or whatever the expo was; the expo were the same, it was just the first part that was diff). </p>
<p>Question: From the perspective of the earth, why does the moon (or sattelite) not crash into earth? I left this question blank. </p>
<p>Question: Something regarding the diameter of a coin if orginal position, f, and image postion are given. I left it blank.</p>
<p>Two answers for two questions in Part A was (according to me): electron and quarks.</p>
<p>I think quark was the answer to one of them, i remember reading something about how it(or a lot of them) makes up a proton or something</p>
<ol>
<li><p>i think there was one problem about a heavier ball and a lighter ball…and the heavier ball having gone further(?) after some time.
-I put ratio of V to SA was smaller in the larger ball</p></li>
<li><p>is the lightest particle a quark?
-I put electron (because 3 quarks = 1 neutron, and so mass of quark = 1/3 neutron?)</p></li>
<li><p>then what was the answer for the next one question (after the light particle question)
-Uhhhh…do you remember the question vaguely?</p></li>
<li><p>what about the problem about a particle with charge 3 microocoloumbs…100V, and distance=10cm between two plates…
-Skipped :(</p></li>
<li><p>anyone know the answer with the lens with index of refraction=1.5…and water =1.33…
-Skipped :(</p></li>
<li><p>last, what about the…question about the rod? the choices were like…negat
ive/positive, neutral and grounded…etc
-Don’t remember :P</p></li>
</ol>
<p>
</p>
<p>I put beats, idk if it’s right or not.</p>
<p>The diameter of the coin question was 6.0. (A, i think)</p>
<p>It was fundamental frequency for the buzzing sound. Beats are something entirely different.</p>
<p>the last one: THere was a ball going east. After a while, a force was put directed at the center. After some time, the center-force was removed. What was the trajectory of the ball.
I put E: it went east, then curved, and then moved at a tangent.</p>
<p>I’m not sure if its the same thing, but I put it went east, curved, and carried on this way diagonally southwest</p>
<p>In part A, the second or third question regarind Doppler Effect: What happens to the freq when the car stays at one spot but the two people (A and B) move to the right?
See compiled answers</p>
<p>Another question: Why is there a buzzing noise? (I am not exactly sure what the question was…) The answer options had “resonance” “diffraction” etc.
I think I put resonance, although I was tempted to put beats</p>
<p>Question: There was something regarding current and time in a wire. I put 1 X 10^-9 (or whatever the expo was; the expo were the same, it was just the first part that was diff). </p>
<p>-I might’ve skipped that :P</p>
<p>Question: From the perspective of the earth, why does the moon (or sattelite) not crash into earth? I left this question blank. </p>
<p>-Constant gravitational pull, but the velocity keeps it from crashing</p>
<p>Question: Something regarding the diameter of a coin if orginal position, f, and image postion are given. I left it blank.
-I multiplied the diameter by 6</p>
<p>I think photons have the smallest mass, but it could very well be an electron.</p>