Physics SAT II Answers

Test Preparation
41

<p>whatd you put for efficiency problem--- </p>

<p>1.) 1000W with .3%??
2.) Also....number 2 with the electron - does it lose electrical or nuclear PE?
3.) The second to last problem - you just multiply the Force times Time or the area of rectangle correct?
4.) Are you sure the lightbulb cannot heat through convection as well? I treat it like a candle in the box and I feel like the bulb can cause convection.
5.) At what point is the pendulum at highest trajectory??
6.) What was the question on the slit-interference question with the whole?
7.) For specific heat, was it 100/.5 = 200?
8.) Does horizontal motion least depend on vertical distance?? Afterall, (choice e- the shape can play a huge role in dealing with air resistance)?
9.) Galileo did not find INTERTIA right?
10.) Electron loses internal energy when electromagnetic is released right?</p>

<p>BASED on OCTOBER RESULTS from the past years, is the CURVE in our favor or not in our favor? What do think is RAW score for an 800 or perhaps maybe a 750 guys?</p>

42

<p>I'm not gonna be a huge help because I'm not the best physics guy you'll find, but might as well compare our answers..</p>

<p>1.) 1000W with .3%??
- I think so, that's what I put
2.) Also....number 2 with the electron - does it lose electrical or nuclear PE?
- not sure which one that was...
3.) The second to last problem - you just multiply the Force times Time or the area of rectangle correct?
- I think so..that sounds like what I did
4.) Are you sure the lightbulb cannot heat through convection as well? I treat it like a candle in the box and I feel like the bulb can cause convection.
- I agree with you
5.) At what point is the pendulum at highest trajectory??
- which one was this?
6.) What was the question on the slit-interference question with the whole?
- it was asking how to increase the diffraction pattern area on the screen behind the slits. (it was wavelength and...forgot, someone already addressed it above...look it up)
7.) For specific heat, was it 100/.5 = 200?
-indeed
8.) Does horizontal motion least depend on vertical distance?? Afterall, (choice e- the shape can play a huge role in dealing with air resistance)?
- I think that's what i put down too
9.) Galileo did not find INTERTIA right?
- I agree
10.) Electron loses internal energy when electromagnetic is released right?
- hm..i think so..</p>

43

<p>1.) 1000W with .3%??
2.) Also....number 2 with the electron - does it lose electrical or nuclear PE?</p>

<p><em>FOR ME, I SAID IT LOSES ELECTRICAL POTENTIAL</em>
3.) The second to last problem - you just multiply the Force times Time or the area of rectangle correct?</p>

<p><em>AGREE</em>
4.) Are you sure the lightbulb cannot heat through convection as well? I treat it like a candle in the box and I feel like the bulb can cause convection.
<em>I WAS THINKING THE SAME THING AT FIRST BUT WHEN I RE-READ THE PROBLEM, IT SAID THAT THE AIR WAS EVACUATED. THEREFORE, CONVECTION ISN'T CORRECT</em>
5.) At what point is the pendulum at highest trajectory??
6.) What was the question on the slit-interference question with the whole?
7.) For specific heat, was it 100/.5 = 200?</p>

<p><em>U MEAN 2000 RIGHT?</em>
8.) Does horizontal motion least depend on vertical distance?? Afterall, (choice e- the shape can play a huge role in dealing with air resistance)?
9.) Galileo did not find INTERTIA right?
10.) Electron loses internal energy when electromagnetic is released right?</p>

<p><em>AGREE</em></p>

<p>aND that's all i remember, sorry about the rest.</p>

44

<p>oh its ok,, i am just concerned with the double slit experiment and the light bulb problem</p>

45

<p>Holy Crap...this thread is scaring me. I am signed up for SATII Physics this November, and I understand hardly any of the stuff discussed so far.</p>

<p>Did you guys find that the PR book covered everything you saw on the test? What about Sparknotes?</p>

<p>I really have to start preparing hardcore. I should also probably change the date to December because I know very little physics right now (horrible teachers).</p>

46

<p>Hey, what was the question when they compared light waves with sound waves and how they differ...I could not find the answer..?</p>

47

<p>ya..i dunno..ur talkin about the medium one, rite?</p>

48

<p>Yes that is the one rupang, the medium one. I totally forget the question... any advice?</p>

49

<p>
[quote]
1.) 1000W with .3%??

[/quote]

The amount of thermal energy released is given by the formula Q<em>out=Q</em>in(1-e).</p>

<p>
[quote]
2.) Also....number 2 with the electron - does it lose electrical or nuclear PE?

[/quote]

Electrons don't have nuclear PE, so it's electrical potential energy, likely.</p>

<p>
[quote]
3.) The second to last problem - you just multiply the Force times Time or the area of rectangle correct?

[/quote]

Force was originally defined by Newton by the equation: F = change in momentum / change in time. Rearranging the equation, F * change in time = change in momentum. This value, F*(change in time) is known as impulse, and can be calculated by finding the area under a graph of Force vs. Time.</p>

<p>
[quote]
4.) Are you sure the lightbulb cannot heat through convection as well? I treat it like a candle in the box and I feel like the bulb can cause convection.

[/quote]

Normally, you'd be right. However, if the air is removed, the case is different. The reason you feel the candle is because the flame heats up the air, which in turn heats up the box.</p>

<p>
[quote]
5.) At what point is the pendulum at highest trajectory??

[/quote]

Highest trajectory? A pendulum only has one trajectory. You mean highest PE? That would be at the top.</p>

<p>
[quote]
6.) What was the question on the slit-interference question with the whole?

[/quote]

Was this a double-slit queston? The distance between bands of interference on a double slit is (lamda)L/d.</p>

<p>
[quote]
7.) For specific heat, was it 100/.5 = 200?

[/quote]

Again, no queston, but Q = mc(deltaT), where Q is the energy, m is the mass, c is the specific heat, and deltaT is the change in temperature.

[quote]
8.) Does horizontal motion least depend on vertical distance?? Afterall, (choice e- the shape can play a huge role in dealing with air resistance)?

[/quote]

Think about it, which will go out farther? If you throw a ball of the top of the cliff, or off the sidewalk. The ball higher up has longer to fall, which means longer to go out.</p>

<p>
[quote]
9.) Galileo did not find INTERTIA right?

[/quote]

No he did not, however he worked on it quite a bit. Newton was the man who developed the idea of inertia.</p>

<p>
[quote]
10.) Electron loses internal energy when electromagnetic is released right?

[/quote]

Yup.</p>

50

<p>First, I thought that it was electrical potential energy that the electron loses in the second question, but I put kinetic energy, because it had a velocity, right?</p>

51

<p>And the galileo question; he didn't find the fact that universe is expanding. It was found out by Einstein. I think I read an article about that.</p>

52

<p>--I think the magnetism question was wrong, because only sensible answer that collegeboard and ets could ask students know was the one with circle magnetic fields, but the direction was wrong for that choice.
--I am not sure about the fractal one was insect; because some parts of an insect are really great examples of fractals (respiratory system)
--Sound waves need a medium in which to travel (including air) whereas the electromagnetic waves do not.</p>

<p>I am not sure about the thin layer of film question. What was its answer? I couldn't decide between diffraction and reflection. (or was it sth else?)</p>

53

<p>quote:
First, I thought that it was electrical potential energy that the electron loses in the second question, but I put kinetic energy, because it had a velocity, right?</p>

<p>I agree with you</p>

54

<p>Flipsta_G;
I think that ets chooses a topic and asks 10-15 question on that topic. In Real Sat 2, it was waves; and for this one, it was gravitational fields and circular motion. And if you want to prepare well (I mean if you want to get 800), almost memorize barron's and read through kaplan's. PR just copies and pastes the same thing that they use for physics B, but it seems that they forget that AP and SAT are DIFFERENT exams. Therefore, use it only for 2 practice exams, which are also different than the real thing. Use sparknotes for only the topics that you think that you don't understand very well. </p>

<p>I worked ~40 hours for physics (we haven't covered half of the physics in class) and I think I will get 800 (71/75, I think)</p>

<p>If you want to get 700, only study kaplan's, which is easiest to understand, but don't ever think that their scale is correct. It asks very easy questions and says that you get 800 if you get about 12 wrong. If you get 12 wrong from kaplan's practice tests, you can only get 700 from the real thing.</p>

<p>Though Barrons practice tests are VERY DIFFERENT from the real thing, it gives you an idea of what you will get from the real thing.</p>

55

<p>then at most how many wrong answers can get a 800</p>

56

<p>I think that 10 wrong can get a 800 in this exam.</p>

57

<p>10 wrongs... that's fine!</p>

58

<p>10 wrongs, because there were very tricky questions; besides I didn't see the word "fractal" in any SAT books. Real Sat 2 book said 10 wrong and a 800 and this exam was even a little little harder than that. So even kaplan's scale can work for this exam.</p>

59

<p>for the "fractal", i left that blank...</p>

60

<p>How many wrong for 750?</p>