<p>
</p>
<p>Yup I got that too (E).</p>
<hr>
<h2>Consolidated List ~44/75 Questions (More than half the test)</h2>
<p>v/2L is fundamental frequency for string fastened at two ends
Resonance was an answer
For the graph given about a wave:
–period = 0.01s
–amplitude = 4
–wavelength = 6
For the graph given about potential energy versus distance:
–potential energy at x1 = a
–kinetic energy at x1 = b
75) B0 or R isnt necessary for emf <strong>(split)
beta particle emission question: nuclear mass stays the same
radioactive decay with half lives after 90 days = 8
Telephone messages —> visual images on screen = fiber optic cables (Confirmed)
students record distance travelled: 10.77 is average velocity / 13.4 m in fifth second (*split)
two magnets are next to eachother:
–1st question: either one or both are permanent.
–2nd question: both are permanent (</strong>split)
Q = cv = 20x10^6
for 73) current is same (E) I1 = I2 = I3 (current stays same in series circuit)
for 74) use resistance eqn. R = PL/A answer was r3(thinnest)>r1(medium)>r2(fattest)
for the beginning like numbers 6-8 given graphs:
–relationship between mass and energy = E = mc^2 = straight line (B)
–relationship between freq. and energy = E=hf = straight line (B)
–intensity of monochromatic blue light (D which is straight line with positive x intercept) (Confirmed)
optics question with converging lens: same size upside down
for 72) f/cos thetha
71) F = 40 N
First few questions:
–1) momentum of II is greater
–2) momentum is same
–3) momentum is same
optics question with plane mirror at an angle: image is virtual and not inverted
Least affects static shock when getting out of car: whether the engine is on (Confirmed)
Pulley with 2 masses of 50 N each and in equilibrium: Force on the rope is 50 N
The efficiency one being 40% (500K and 300K)
B for the field line diagrams w/ two opposite charges
30m for dropping something off a cliff
“II only” for the one with large and small boxes with temperature transfer
For the 5 diagrams as choices with a satellite orbitting a planet. Mass and Radius varied.
–First problem, asked which had greates grav. force = answer E (m=2M r=R)
–Second problem = E (m=2M r=R)
Linear Expansion problem:Temp raised from 20 to 22 over to 20 to 30. deltaT raised 5x, so L raised 5x, and the answer = 0.015 cm
Rutherford Experiment problem: The size of nucleus was significantly smaller than that of the atom
Elevator problem: I only
Which of these could make the net force 0: I and II only (I got “vector sum=0, and that some could be in the same direction”, but not that they could be the same magnitude)
Work is the only nonvector quantity
Wave generator (deep –> shallow): The eqn that relates it is s1/lam1 = s2/lam2 because freq doesnt change : Answer = velocity of the waves changes (can’t remember values but used that equation to get ans = 3.2)
Which waves can interfere(sound somethign somthing) Answer: I, II, and III
Negatively charged rod and X and Y are ends of a piece of metal: Answer: voltage / net force = 0 (**split)</p>
<p>What did everyone get for the acceleration to the students recorded distance traveled one and also, the one about the proton being dropped to a positively charged plate and which was NOT correct?</p>
<h2>intensity of monochromatic blue light (D which is straight line with positive x intercept) (Confirmed)</h2>
<p>Why isn’t it the constant function? I thought intensity had no effect on the energy of emitted photons, but only changed the number of photons released.</p>
<p>for the proton one i got it down to V and KE… V is zero and the proton still has “vibrations” so it STILL HAS KINETIC ENERGY</p>
<p>for the acceleration i got the average velocity of the whole thing. if it started at 0 then the average speed is half the final, and with the final speed and time (given) u get acceleration
I KNOW NO NIUMBERS</p>
<p>jnredo</p>
<p>what was the question?</p>
<p>It was asking which graph showed the energy of each emitted photon versus the intensity of the blue light shone on a surface.</p>
<p>oh yeah it should be cpnstant thats what i did</p>
<p>Ok I remember putting 1.3 for the acceleration. Does that ring a bell?
Also, have we reached a consensus for the answer to the first question in that student recorded distance thing?</p>
<p>Yes, I put 1.3 also.</p>
<p>for the height of the cliff one, I got a 80M cuz it took the thing to fall 4 secs
and if you put that 4 sec in to the equ (1/2)gt^2 you get 80</p>
<p>elationship between freq. and energy = E=hf = straight line (B)
i’m pretty sure this one isn’t B. its the one with a linear graph but shifted to the right
cuz KE=hf- work fucntion</p>
<p>Me too, gohackers.</p>
<p>and i thoguht it was a 60% for the eiffiencicy
cuz its 300K/ 500K * 100</p>
<p>75) B0 or R isnt necessary for emf **(split)
and for 75 its Bo for sho
think about V= IR
depending on the R , I is determined accordingly.
adn B0 doesn’t matter cuz its the change in B that matters</p>
<p>wasn’t it 40% efficency? because (500-300)/500</p>
<p>beta particle emission question: nuclear mass stays the same</p>
<p>I thought this one was the atomic number changes or something like that
cuz when a beta particle is emitted, the atomic number of an atom goes up by 1?</p>
<p>yeah gohackers i got the same thing for the cliff one, and in a diff way so im pretty sure its right (80)
and for the nuclear one i got same thing too, mass doesnt change, but atimic # does (conservation of charge)</p>
<p>@ gohackers, are you sure that the question asked for KE as in the photoelectric effect, and not just E=hf in general for the graph one?</p>
<p>i’m pretty sure. I’ve seen a very smiliar problem like that.</p>