December 2010 - Physics Subject Test

<p>Undisputed answers so far:</p>

<p>antimatter question: positron
water is boiling: upper most straight part
Index of refraction: sin 60 / 1.5
Given initial velocity, mass, and stopping time: 1, 2, and 3
Force x time = change in momentum
What led to the nuclear model: gold foil experiment
Skydiver jumping off of a plane: potential energy > kinetic energy
Throw ball a up and ball b down at same initial velocity. Whats the velocity of ball a: v (same as ball b)
Half covered lense: full object, but decreased intensity
Index of refraction is 4/3: wavelength is 3/4
Which waves will result in the least disturbance: 6 + (1/2)wavelength
Man is standing underneath water: only choice 1 (the bird and the tree appear to be higher than they actually are)
Particle question where you know the rotational speed of the giant ball with a slit in it: you can only find the speed of the particles
Students climbing stairs - heaviest one
Pv = nrt : t increases as q increases
Heaviest: neutron
Concave mirror: virtual image
Convex lense: real image both small and big
acceleration due to gravity: 1/9
Theta and initial velocity one: Just increase the initial velocity
Worker kicks the bucket: 2 m
Must be electrical field: point charge
Must be magnetic field: bar magnet
Ammeter question (based on drawing from ImageShack® - Online Photo and Video Hosting)
Highest: 1 and 2
Lowest: 4 and 5
Vector direction for electric field: West
Vector direction for negative point charge: East
Mass of object in pulley problem: 1.2 Kg
Projectile: net force is constant, direction of net force is constant, angle of net force with path is changing
Object rotating around planet: net force is constant, direction of net force is changing, angle of net force with path is constant (always perpendicular to path)
Speed of light question: 10^-13 J
Traffic light question: All colors except red are absorbed
Piano question: wavelength and period both decrease
emf question with coil and battery: current is induced in all cases except when the coil and magnet have the same velocity
Firetruck question: Velocity of truck + velocity of sound in air
Velocity of puck after collision: 4 m/s
Elevator: 24 N
Graph displaying vertical displacement as a function of time: Vertical spring and rippling tank
Heat transfer question: 3 watts
Difference between sound waves and light waves: polarization
Mass falling through air: 1 and 2 are right, but 3 is wrong (Adding mass doesn’t ■■■■■■ its fall)
Superconductor question: 0
Capacitance question: 2 V
Dark room question: tungsten
Pendulum question: Decrease the length
Electric rod question: It was positive
Box moving with constant velocity on a rough surface: The force of friction is equal to the appied force.
Sound wave passing into another medium: Only choice 1 was correct (3.3 x 10^ of something)</p>

<p>Disputed questions:</p>

<p>None</p>

<p>there was a question about conservation of charge principle. the answer was the total net charge is the same</p>

<p>Right i’ll add that</p>

<p>Anything else? Do you have aim? we can chat about the test on aim.</p>

<ul>
<li>the force which goes from F to 4F for charged spheres</li>
<li>force that 2 parallel wires exert on each other
I think the answer was q to 4q for the first one, and all 3 choices for the second one.
sorry, I do not have any chat prog. My parents think I spend too much time on them (no more fb either!)
Cannot remember any other question</li>
</ul>

<p>Yeah let me add those answers</p>

<p>did you take the math2 test as well?</p>

<p>If Revolution’s list is correct, I’ve missed 1 or 2. Combined with my 2 omitted and potential 2 additional wrong answers because of carelessness/arrogance, I think I have an 800!</p>

<p>For some reason, I didn’t picture a tank of water when I read ripple tank so I only put I for the sin graph one.
The other one I might have missed is the 2 farad-capacitator discharging for 0.1 second question. Would someone explain that one to me. I vaguely remember guessing 2 volts but I really wasn’t sure of my process.</p>

<p>Undisputed answers so far:</p>

<p>antimatter question: positron
water is boiling: upper most straight part
Index of refraction: sin 60 / 1.5
Given initial velocity, mass, and stopping time: 1, 2, and 3
Force x time = change in momentum
What led to the nuclear model: gold foil experiment
Skydiver jumping off of a plane: potential energy > kinetic energy
Throw ball a up and ball b down at same initial velocity. Whats the velocity of ball a: v (same as ball b)
Half covered lense: full object, but decreased intensity
Index of refraction is 4/3: wavelength is 3/4
Which waves will result in the least disturbance: 6 + (1/2)wavelength
Man is standing underneath water: only choice 1 (the bird and the tree appear to be higher than they actually are)
Particle question where you know the rotational speed of the giant ball with a slit in it: you can only find the speed of the particles
Students climbing stairs - heaviest one
Pv = nrt : t increases as q increases
Heaviest: neutron
Concave mirror: virtual image
Convex lense: real image both small and big
acceleration due to gravity: 1/9
Theta and initial velocity one: Just increase the initial velocity
Worker kicks the bucket: 2 m
Must be electrical field: point charge
Must be magnetic field: bar magnet
Ammeter question (based on drawing from ImageShack® - Online Photo and Video Hosting)
Highest: 1 and 2
Lowest: 4 and 5
Vector direction for electric field: West
Vector direction for negative point charge: East
Mass of object in pulley problem: 1.2 Kg
Projectile: net force is constant, direction of net force is constant, angle of net force with path is changing
Object rotating around planet: net force is constant, direction of net force is changing, angle of net force with path is constant (always perpendicular to path)
Speed of light question: 10^-13 J
Traffic light question: All colors except red are absorbed
Piano question: wavelength and period both decrease
emf question with coil and battery: current is induced in all cases except when the coil and magnet have the same velocity
Firetruck question: Velocity of truck + velocity of sound in air
Velocity of puck after collision: 4 m/s
Elevator: 24 N
Graph displaying vertical displacement as a function of time: Vertical spring and rippling tank
Heat transfer question: 3 watts
Difference between sound waves and light waves: polarization
Mass falling through air: 1 and 2 are right, but 3 is wrong (Adding mass doesn’t ■■■■■■ its fall)
Superconductor question: 0
Capacitance question: 2 V
Dark room question: tungsten
Pendulum question: Decrease the length
Electric rod question: It was positive
Box moving with constant velocity on a rough surface: The force of friction is equal to the appied force.
Sound wave passing into another medium: Only choice 1 was correct (3.3 x 10^ of something)
Conservation of charge: net charge is the same
Force on point charge question: 4q
Net force on parallel wires: dependent on all three things (current, length, and distance)</p>

<p>Disputed questions:</p>

<p>None</p>

<p>Throw ball a up and ball b down at same initial velocity. Whats the velocity of ball a: v (same as ball b)</p>

<p>Mind explaining this one? I put 2v. Shouldn’t it accelerate more if it starts free fall from a greater height?</p>

<p>Arrgh, the test was so frustrating. I think i’ll score a 730 or something… (sigh)</p>

<p>T-T i think i did bad…
10 blank…
maybe in the 600s?
hey so im definitely retaking january…
but should i cancel or just send both scores??
i’ve already sent in all my scores til now so that colleges dont receive todays score but still get the scores from before…</p>

<p>10 blanks doesn’t mean a 600 dude :slight_smile:
If you didn’t miss a lot of the other answers, then you should do pretty fine, in the high 700s</p>

<p>@Jimmy</p>

<p>You have to consider total mechanical energy. The ball thrown up will have energy equal to PE and KE. KE gets converted to PE going up, and that total PE is converted back into KE going down. For the ball thrown down, that KE remains KE while its PE is converted to KE. Thus, they will have the same combination of energy at the bottom. The ball thrown up just takes longer to fall.</p>

<p>nono… i did miss quite a lot on othe other answers dude…
but keep telling me its fine.</p>

<p>Damn. I read the question wrong. Somehow I managed to convince myself that the first ball starts from rest while the other is thrown from the same point upwards with v(0) and then free falls. Smart on my part. That question was insanely easy.</p>

<p>Can someone explain the pulley problem with the spring scale? Was the spring scale lying on top of the table or attached to the wall and suspended in the air? Because the answer would be different for the two circumstances. anyone?</p>

<p>How much do you think the CURVE will be?</p>

<p>Any predictions for 7 skipped and at least 5 wrong? Hopefully still 700+ ._.</p>

<p>I’ve heard that the curve on every test is, like, about 10 questions. so, you should be able to score in the upper 700s if that’s all you got wrong. :slight_smile: But every tests differs because of variations… i.e. if the test is harder and the average score is lower, then the curve would be more. Was this test harder than previous sat physics tests that you guys have taken??</p>