<h1>254: i could have sworn it asked where is it liquid, which would be C (thats for number 1 on the test)</h1>
<p>hm i think ur right. so is that the same question as
[quote]
2. The question im talking about is pick the graph - as the distance between two point charges increases ,the force between them decreases hyperbolically (THIS IS A PiCK THE GRAPH QUESTION)
[/quote]
?</p>
<p>grade inflation, when you said "i think ur right" in 262, who were you talking to?? and i agree with the answer to the one you quoted</p>
<p>to 1991. it asked boiling so it was D sorry =[</p>
<p>1991- i Dont remember the question, but this is how you do it</p>
<p>U = Q +W</p>
<p>IF the gas is compressed, you do +W
If the gas expands, you do -W
If heat is absorbed, you do +Q
If heat is released, you do -Q</p>
<p>So say, hypothetically, that the gas compresses 20 J and releases 10 J of heat</p>
<p>Internal energy increases by 10 </p>
<p>^THIS IS NOT THE ANSWER BTW< JUST A HYPOTHETICAL SITUATION</p>
<p>gradeinflation and everyone else: I know that number 2 asked for boiling, which was d
but what did number 1 ask for and what was the answer</p>
<p>and for that one with the plane mirror and concave lens, were they at angles towards each other??</p>
<p>1 asked for completely solid water, which would be < 0 degrees celcius</p>
<p>yeah it was A</p>
<p>so how many do we need? and how many do we have? lol</p>
<p>any more? :p</p>
<p>I remember something about the earth's velocity changing as it orbits the sun in a I II III question (unless that's a practice test I took). Anyone? Oh, and can someone post a compiled list ?</p>
<p>i think i remember that earth/sun one too. umm... i think the magnitude of the force on each is always the same. the acceleration experienced by each is not the same, and the earth does not have the same kinetic energy throughout its orbit or something.</p>
<p>KE is the same. but V is not. Kepler's law</p>
<p>Wait a minute...
If v is different, wouldn't KE be different?
Remember, KE = (1/2)mv^2
Therefore, KE is proportional to v</p>
<p>no, oops i meant Total mechanical energy is the same. KE and PE change</p>
<p>Okay, here's my list, not complete, definitely not in order (except for the ones with +s to the left). Has some unique information:</p>
<ul>
<li> 1 A boiling graph, solid == A (sloped segment to left)</li>
<li> 2 D boiling graph, boiling == D (flat segment to right)
3 ?
? 4 ? ball of iron@100deg in water@0deg becomes 10deg == specific heat of water is >
5 ?
6 ?
? 7 ? pulley with two masses at different heights == masses are equal
8 ?
? 9 ? one plane goes north, other east == northwest
10 ?
11 ?
? 12 ? can serve as a hydrogen nucleus == proton
? 13 ? can capture 2e to become helium atom == alpha particle
? 14 E has greatest charge-mass ratio == positron
? 15 ? wave graph, one wavelength == point at 1 wavelength
? 16 ? wave graph, travel in period of 2t = point at 2 wavelength
? 17 B wave graph, which one goes towards top of page == B, I think
? 18 ? planet orbiting at faster rate == tangential force
19 ?
? 20 ? angle of incidence, angle of refraction == ??can't remember??
21 ?
? 22 ? Object thrown vert. reaches height of 20m == 20m/s on the way down
23 ?
24 ?
? 25 ? on moon w/ 1/6 g, you can throw == 6x higher
26 ?
? 27 ? elastic collision, one object hits another at rest == conservation of energy
? 28 E waves that undergo diffraction == radio, microwaves, sound waves
29 ?
? 30 ? weight tied to beam of very tall building (can't see top) == stopwatch
? 31 ? sound + light are similar in all but == sound requires medium
? 32 ? sattelite, gravity suddenly stops == moves tangential
33 ?
? 34 B 2amps runs through for 0.5 hours == 3600 coulombs
? 35 ? circular curved ramp, which increases == only Force
? 36 ? circular curved ramp, which decreases == only potential energy
? 37 ? scuba diver sees bird == ??bird appears higher, is actually lower??
? 38 ? something about ramp question == Ff=F||, F(normal)=Fg perp.
? 39 E two polarized plates at 90 degrees == no light gets through
? 40 C Electromagnetism pictures == straight wire, feild lines circling it
41 ?
? 42 ? a device that stores energy (transformer, capacitor) == capacitor
? 43 ? earth has rad. r, sattelite 3r away, what's centripetal accel. == 1/9 g
44 ?
? 45 ? application of formula x=x1+vt+1/2at^2 == inclined plane
? 46 ? graph with dotted curved lines and segments == segment c
? 47 ? picture of convex lens in box == straight through, bends in
? 48 ? picture of concave lens and mirror == 90 degrees, bends outwards
? 49 ? B-field, two wires, distance from other if one is L == 2L
? 50 ? two 2ohm resistors in parallel, voltage across either == 3V
? 51 E lens on glass, light+dark bands == interference
? 52 ? incline 30 degrees, parallel force from gravity == 1/2g
? 53 ? distance from moving observer @ 9c/10 == less than stationary, greater than 0
? 54 ? which has greatest EMI (diagram w/ vertical lines) == D at top of circle
? 55 ? which charges have a force of 0 at the center == one with same diagonals
? 56 ? which have the greatest force at the center == one with all twos
? 57 ? 2000kg @ 20m/struck has 500kg dropped in it == 16m/s
? 58 E which is not a fractal (mudcracks, shape of bugs body) == shape of bugs body
59 ?
? 60 ? a spring is oscillating, what should you change == k value of spring
? 61 B tree 25 tall, 100m, lens, 0.1m == 0.025 tall image
62 ?
? 63 ? Charged particle fired through plates == moves towards top plate parabolic
? 64 ? weight lifted on string (pendulum, NOT BULDING, diagram) == ??can't remember??
? 65 C Photoelectric Effect, Zinc, somethingx10^-7 m wavelength == 4eV
? 66 ? two very close charged plates == straight line graph (essentially capacitor)
67 ?
? 68 D South/North poles, attract iron filings == attract/attract
69 ?
? 70 ? something completely unrelated, can't rememeber question == F/m
? 71 ? graph, horizontal velocity == constant, straight line
? 72 ? graph, vertical velocity == straight line going diagonal up
73 ?</li>
<li>74 D Boat, most similar to rocket propulsion == throwing stones</li>
<li>75 E Something about earth == II and III</li>
</ul>
<p>so how many dont we know? :p</p>
<p>lol we dont know 20? thought we knew more than that :D</p>
<p>I think we do, but I'm too lazy to dig through this thread and figure everything out. I think we have most of it.</p>