MAY 2013 PHYSICS THREAD (question pool)

Test Preparation SAT Subject Test Preparation
161

<p>Like this I believe <a href=“http://i.imgur.com/XDgdUEj.png[/url]”>http://i.imgur.com/XDgdUEj.png&lt;/a&gt;&lt;/p&gt;

162

<p>Okay good…I guess 12 wrong should still be an 800 then. There was some other question I guessed on I can’t really remember, it was before the bell damping one. Was damping the correct answer to the bell question and does anyone remember the question before?</p>

163

<p>wasn’t the question before damping one choosing appropriate graph for a given situation? How many graph questions were there in part A? kmb987’s list shows 3</p>

164

<p>Damping is definitely correct. The question before it, i think, was the one about the stars seeming below (above?) their actual position when near the earth’s horizon. I put refraction for that one.</p>

<p>Also, in the question about red light being diffracted less, there was an answer choice to do with dispersion (i put that one). How come that one’s not right?
There was also a choice about changing (increasing? i forgot) the length of the bar in the rate of heat transfer question. Why is that not right either?
How come the ball in the spiral going straight out tangent isn’t right? did it say somewhere in the question that the spiral was vertical and there was gravity or something?</p>

165

<p>For red light being diffracted less, I believe dispersion wasn’t an option because I remembered looking for it. In the rate of heat transfer one, Q = kA(T<em>h - T</em>c)/d and the option you’re thinking of was “decrease the length of the bar” which would increase Q. Increasing T_c would cause Q to decrease. In the spiral one, I would assume they didn’t mean there was no gravity unless it was a trick question…which I suppose is possible</p>

166

<p>If you increase the length of the bar, heat transfer decreases. However, as far as i remember, the answer choice said ‘decrease the length of the bar.’
The ball in the spiral travels in a straight path after coming out. I’m pretty sure of this. </p>

<p>btw, does anyone remember choosing a quadratic graph as an answer for part A graph matching questions?</p>

167

<p>[PhysicsLAB:</a> Spiral Tube](<a href=“PhysicsLAB”>PhysicsLAB: Spiral Tube)</p>

168

<p>Wait why would it be a straight path? Was there no gravity?</p>

169

<p>Wasn’t it like this? <a href=“http://i.imgur.com/TV25Kvx.png[/url]”>http://i.imgur.com/TV25Kvx.png&lt;/a&gt;&lt;/p&gt;

170

<p>@kmb987: Read the question. It said lying horizontally on the table.</p>

171

<p>why would it curve to the right when there’s no force acting on the ball?</p>

172

<p>I remember searching for a statement about gravity, but I don’t think I found one, so I picked the straight path (B, i think)… The tube may have been flat.</p>

173

<p>It would curve to the right because of the gravitational force, if it was horizontally flat then it would still fall.</p>

174

<p>The question said that the tube lies flat on the table. Not to its normal</p>

<p>@wlsnehf: Yes; one of the answers I put was a quadratic graph. For one of the questions, it said acceleration was increasing at a steady rate. Al the graphs in the answer choices were between speed and time.</p>

175

<p>“Graph of speed when a ball is thrown up and then falls – decreasing to 0, then increasing”</p>

<p>Does anyone else remember this question? If yes, what did the graph look like?</p>

176

<p>|…/…
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177

<p>I came up with 68questions that I can remember:</p>

<p>Greatest number of proton?
Greatest number of neutron?
Feather in vacuum free fall graph (linear graph)
Ping-pong ball free fall graph (logarithmic)
Speed of ball thrown up and then falls. (Decreasing to 0, then rises again)
Constantly increasing acceleration graph (quadratic curve)
Smaller sound due to damping
Earth and stars…… refraction
Elevator weight (0<x<250)
Elevator weight (same)
Elevator weight (zero)
Which block accelerates upwards?
Which block moves at constant velocity?
Magnetic filed of point charge?
Magnetic filed of plate and point charge?
Magnetic field of loop
Magnetic field of solenoid
A boy pushing a girl on a skateboard
Induced current direction?
Y=kx relationship
Y=kx relationship
Doubling R and V → I stays the same
Heat can move by… 3 ways
Center of mass in a circle?
Compare PE of 2 pendulums.
Current through circuit? 2A
Diagonal force applied to an object with angle of x. Acceleration=?
E=V/d
V=Ed
Period of car in circular motion?
Centripetal force acting on the car
Rutherford’s gold foil experiment: positively charged nucleus.
Best supports wave-nature of light? Diffraction.
Earth radius doubled. Force doesn’t change.
2nd Law of Thermodynamics. Heat released cannot be 0.
Temp of room?
Rate of heat flow?
Ratio of speed of 2 lights
3 charges present. Net force the middle one experiences = 0.
Radioactivity 160.
No electrons escape from metal because energy not enough.
Water, ice, water vapor in one box
Prism question.
Finding wavelength of light when frequency and speed are given.
Plane mirror image virtual and erect
Inv sq relationship – light and gravity
Decreasing rate of heat transfer? increase Qc
Relativity shorter length, longer time
Photon hits a box with 2 atoms
Scientist?
Which time should the experimenter use? 4.1s
Why is the theoretical value different from 4.1s? Air resistance
Find V and d when 2 people are in a cart throwing a ball. No change.
Ammeter placed in a wrong position
Marble in spiral tube
Node, antinode ration is 1:1
Frequency is 50Hz
3 balls on the origin, 1 ball travels to the 2nd quadrant with 5m/s
Wavelength changes. Color changes?
Increase period of pendulum? Increase length
Velocity and acceleration same direction
Capacitor charge after long time?
Velocity of particle in free fall if it’s not on the ground yet?
Angle of refraction and angle of reflection inc or dec if incident angle inc?
Beat is…? Different frequency sounds blah blah…
Plain mirror in a mystery box
Velocity of a mass on a spring: sinusoidal graph
Kinetic energy of block at bottom – 105J</p>

<p>Can someone add 7 more so we hv a complete list? haha</p>

178

<p>Did you say that angle of refraction/reflection both increase? Then 8/7 or something for the ratio of light speeds, and the speed in free fall as gt? Also, I think I remember 0.75 as the answer for something but I don’t remember the question</p>

179

<p>I am so scared out of my mind! :-(</p>

180

<p>I think the 0.75 was the answer to a snell’s law question.</p>

<p>Also, can someone please draw or explain the diagrams each of the magnetic field line questions were supposed to be? The solenoid and the ring one really confused me</p>