SAT Physics June 2012

Test Preparation SAT Subject Test Preparation
41

<p>@feedback411 to your second question, yes.</p>

42

<p>yeah it won’t.
EMF will only be produced if the two move relative to each other.</p>

43

<p>@dinero: no, the sphere has to be positively charged because that would cause the negative charges to move up and out of the electroscope leaves.</p>

44

<p>Power = Work / Time
Work = F * D * Cos Theta
Since students are going up, F = weight of the student
So heaviest is the correct answer</p>

45

<p>-Heaviest particle?
Neutron</p>

<p>-Anti matter?
positron</p>

<p>-What occurs in light waves but not sound wave?
polarization</p>

<p>-What was the charge of the ball (electroscope)?
positive because then the top of the electroscope would have more negative charges and the leaves will have more positive charges therefore making them get closer (reduce repelling force)</p>

<p>-A Straight wire going through magnetic field has emf.
I, II, III all of them (E =Blv)</p>

<p>-When electron is turned into energy?
E=mc^2 so 10^-13
8.1<em>10^-14 -> 1</em>10^-13</p>

<p>-Diver in a pool and the bird question
The bird seems like it’s higher </p>

<p>-Minimum inteference from point M and N to P
5 / 5 and 5 / 6</p>

46

<p>For the electroscope, couldn’t it be either positive or negative, because the sphere could be positive, thus transferring charge to the leaves and making them come closer together, or it could be just less negative than the leaves, in which case it would still transfer positive charge to the leaves and cause them to come closer together?</p>

47

<p>Ran out of time… had 10 questions left to answer lol with like 4 more omitted previously and definitely 1 wrong, maybe 3… although this is what i get for not studying as much</p>

48

<p>Does anyone’s HS class cover even half the topics on this test? How many HS classes cover optics/special relativity, particles , etc.</p>

49

<p>@compscigeek if you only got 3 wrong and 14 omitted you still got a 60.25 raw score which means an 800</p>

50

<p>-How to decrease the period of a pendulum?
Decreasing length of the string
T=2pi*Radical(l/g)</p>

<p>-Battery question, which has highest / lowest current?
highest = 1 / 4
lowest = 2 / 5 ( don’t remember the number exactly but connected)</p>

<p>-Which is completely inelastic?
The ball sticks to another object</p>

<p>-Car decelerating, given time to decelrate, deceleration etc. you can find?
I, II, III all three</p>

<p>-0.2kg ball moving at 8m/s hitting 1kg ball moving 2m/s, 0.2kg ball going backwards at 2m/s, the speed of 1kg ball?
4m/s</p>

51

<p>@LakeClouds</p>

<p>I took AP Physics B, which does cover optics and particles(atomic physics). But relativity is not covered on the AP test, so we learned it after and luckily, we just learned a little bit since the AP test, although not all of it.</p>

52

<p>no if he got 3 wrong it means he got -18 or 57 raw which is definitely not an 800</p>

<p>@lakeclouds No, mine definitely doesn’t. Mainly self studied</p>

53

<p>@lakeclouds definitely not. I’m in freshman honors physics. I had to learn all E-M stuff, modern physics, thermal physics, not-uniform circular motion, torque, and mirrors by myself. we covered optics.</p>

54

<p>@michaelgscarn 3 wrong is 3/4 of a point. they penalize wrong answers by 1/4 a point each. and 57 raw would still be like a 780</p>

55

<p>Can one of you post where your getting the curve from?</p>

56

<p>i’m using the blue book and PR, not a link. if you google it, the sparknotes scoring is too mean. just know that a 60+ is an 800, and then it goes down by 10 for every 1 or 2 raw points or so</p>

57

<p>@ Baneling: </p>

<p>Wouldn’t the charge on the sphere be negative since it pushes the two leaves closer together?</p>

<p>Also, destructive interference happens at (n+1/2)(lambda) wavelengths. Constructive occurs at integer wavelengths.</p>

58

<p>@jimmy8907</p>

<p>For electroscopes, if you bring negative charge closer to the top part of it, positive charges will get attracted to the top and as a consequence more negative charges on the bottom, which will repel more. </p>

<p>And yes that’s true but the question asked for minimum inteference, which should be constructive inteference not destructive</p>

59

<p>Well, considering the curve, I think I have a shot at 800, but I’m not sure. I should’ve left the electroscope one blank considering I don’t even know what an electroscope is. -_-</p>

60

<p><a href=“http://i.imgur.com/qM39U.png[/url]”>http://i.imgur.com/qM39U.png&lt;/a&gt; here’s one of the problems</p>