June 2006 - Physics

Test Preparation SAT Subject Test Preparation
401

<ol>
<li>I put shape of rock matters least.</li>
<li>I think I got m2/m1 or m1/m2 or something like that</li>
</ol>

<p>Then for another question with a picture of two objects and it asked which looked like the motion of the two objects off a cliff; I chose the one where both paths were the same path. I'm not sure if you have this question on that list.
For the radial/tangential acceleration, does anyone remember how the correct answer was worded? I may have gotten that one wrong. The question was, if the tangential velocity is increasing or something, lol. Thanks!</p>

402

<p>Wasn't 33 a question about which affects the motion of a rock least? Then it listed several things:</p>

<p>a. Angle of projection
b. Height of the rock from the ground
c. Varying gravity while the rock is in motion
d. Wind</p>

<p>I put wind..</p>

<p>and for number 52, wasn't the question a qualitative one about why the larger ball falls slower than the smaller ball with both having the same densities?</p>

<p>And I don't recall there being a question about to objects off a cliff though I could be wrong..Hm. That last one the question was which are true when an object/ball/rock is moving in a circle with increasing acceleration.</p>

403

<p>I meant 53, sorry. Btw, lobstar, thanks SOOOO MUCH for typing up all those questions!!!!!! Here's a <em>hug</em></p>

404

<p>Oh okay. Yeah I don't remember 53 either..the question, I mean.</p>

<p>Ah yerse. <em>hugs lobstar</em> </p>

<p>Merci ;)</p>

405

<p>lol guys just trying to help :)</p>

<p>well wind affects range cuz its a x force and a y force so ...</p>

<p>and for the radial / tangential one what did you guys put?</p>

<p>and the one about the corect magnetic field is 38 the anticlockwise one wire with current and correct current u do the right hand rule 2nd one for wires</p>

406

<p>What's the consensus on the phase change/diffraction question?</p>

407

<p>i put phase change but i think its diffraction now cuz thin film kinda has a phase change</p>

408

<p>i thought it was diffraction...</p>

<p>i know for sure that there is a phase shift of 180 deg when light is reflected from the boundary between a fast and a slow medium (going from fast to slow)...i learned it in IB Physics</p>

<hr>

<p>Thanks lobstar so much!</p>

<p>I think you forgot the question with the sheet of metal and the hole...so there's question #74! Just need one more!</p>

<hr>

<p>For that radial/tangential acceleration problem, i think i put down "the net force on the tangential speed is increasing" or something to that effect...</p>

<hr>

<p>For the question that asks at what point is the wave moving up, why is it D? If you draw in the wave at a later moment (where it moves to the right), you see that B is clearly the answer.</p>

409

<p>Ooh, cuz I thought that diffraction also occured in film =\
Ahh, o well '_'</p>

410

<p>oh sorry Evvivan</p>

411

<ol>
<li><p>Where 2T is on the wave : E</p></li>
<li><p>[another way to solve] Answer: 240 ohms
P = IV → (P: 60W / V:120V) → 60 = 120 I → I = 1/2 → V=IR → 120 = 1/2 * R → R = 240</p></li>
<li><p>Plane mirror one 10.5 i think if its distance from image to person
Child: 3.5 cm from a plane mirror
Adult: 7cm from a plane mirror
Question: How far the adult's virtual image from the child's image? (Is question right - Plz Confirm)</p></li>
</ol>

<p>→ 7 - 3.5 = 3.5</p>

<ol>
<li><p>Asteroid question: [Princeton Review - Physics subject practice test 2, #75 on page 333] </p>

<h2>The actual test asked : what thing would be ovserved the greatest length?</h2>

<p>Princeton review
"75. Five identical spaceships take off from Planet X, and each passed by Planet Y at a constant speed on its way to Planet Z. A science station on Planet Y observes them passing by. The Spaceship traveling at which of the following speeds would be observed to have the greatest length?"
(A) 6<em>10^7 m/s (B) 9</em>10^7 (C) 1<em>10^8 (D) 1.5</em>10^8 (E) 2*10^8</p>

<h2>Answer: (A) The book said, "The faster a spceship passess by the station, the shorter its legth is observed to be. This is because as V increases, the relativistic factor (Gamma) increases, so the amount of length contraction increases. Therefor, the smaller the V, the smaller the value of (Gamma), and the longer the ship will be observed to be. Of the Choices given, the speed in choice A is the smallest." </h2>

<p>The actual test: I think this one like the princeton maybe the smallest velocity one. (0.1c, 0.6c, 0.7c ..... ----→ 0.1c) </p></li>
</ol>

<h2>34. bulb question : [Kaplan's SAT Subject Test: Physics - Practice Test 3, #57] In Kaplan, there is a diagram (candle in a metal container). In the actual test, there was a diagram (bulb in a metal container). I'm not sure whethere the actual test said "there is no air in a container" or not. However, when you guys see Kaplan's.</h2>

<p>[Similar diagram as the actual test]
Question 57-58 refer to a candle burning inside the metal container shown above. Three types of heat transfer lister below.
I. Radiation / II. Conduction / III. Convection</p>

<p>Question: Heat can be transferred to the inside surface of the walls of the container by which of the above? </p>

<h2>Answer: I and III only</h2>

<p>In my opinion, above Kaplan's question and the actual test's question are similar or same, that's why 'Convection and Radiation' is the answer, "I think".</p>

<p>And: Camera lense proble - Question: Solve the magnitude.
Answer I think : 0.0025 or 0.025. (Plz Confirm)</p>

<ol>
<li>[Correction] 4 m in 2.5 hrs and 2 m in .5 hours find average "Speed"
or the question asked 3m in 2.5 hours and 4m in 3.5 hours, find the average speed.
Answer: both 2m/hrs </li>
</ol>

<ul>
<li>The physics test which was taken in oversea and the physics test which was taken in the states are different format?</li>
</ul>

412

<p>And: Camera lense proble - Question: Solve the magnitude.
Answer I think : 0.0025 or 0.025. (Plz Confirm)</p>

<p>CAN SOMEONE PLEZZZZ confirm this question b/c i got the same thing</p>

413

<p>I got 0.025 I think. Distance of image/Distance of object = magnification.</p>

414

<p>Hm..can someone recompile them with all the new/corrected answers? Thanks. XD</p>

415

<p>anyone have any other ideas about the radial/tangential acceleration problem?</p>

<p>just radial acceleration?
just tangential acceleration?
both?
neither?
net forces increasing?
decreasing?</p>

<p>???</p>

416

<p>Larger force toward center of circle since:</p>

<p>F = mv^2 / r </p>

<p>Since v increases, the centripetal force must increase as well.</p>

417

<p>i dont think that was an answer choice </p>

<p>answer choices were lyk tangential force is 0 radial force is 0 radial and tangential forces r equal and 2 more i dont remember but they wanted which one will cause the thing to accelerate</p>

418

<p>Yeah..mv^2/r was not a choice. The answers were worded-answers, not numerical/variable answers. For that one I think I put tangential + radial acceleration..or tangential + something.</p>

419

<p>Well... centripetal force is radial force, so radial force increases..
I actually forgot which answer choice I marked on the test though. '_'</p>

420

<p>u had to isolate for wahtever variable they were looking for i think.</p>