<p>ok that’s what i thought, so the bird is still above the water, but closer.</p>
<p>the test was a lot easier than i expected it to be…especially if the curve is still around -10 = 800. </p>
<p>i am wondering, however, why there is no chem thread. if anybody took the chem exam today, please help me start a thread so we can go over answers.</p>
<p>wait, what were the choices for the bird one?
was the answer the one with the bid being higher?</p>
<p>ballin@thebubble, I put the one with the most charge as the one with four 2q charges.</p>
<p>The one with zero field in the center looked something like:</p>
<p>+q -q</p>
<p>-q +q</p>
<p>yeah, thats what i put :D</p>
<p>ok so does anyone have a final consensus on the bird problem?</p>
<p>how about the one with the two planes, one going east and the other north. Something about relativity</p>
<p>i put northwest for that i think</p>
<p>edit: nvm, i dont remember :P</p>
<p>lol I guess we’ll never know. Everyone seems pretty split on it… It just made more sense to me for the bird to be below. It’s like when you look at a pencil in water, or when you observe the surroundings from underwater when swimming… lol I can’t believe I was actually trying to recall what things looked like this summer whilst swimming…</p>
<p>EDIT: Yep I put northwest.</p>
<p>You can draw a diagram. X moves right and Y moves north:</p>
<p>^
|.
|…
Y…<br>
X ----></p>
<p>The diagonal is the resultant vector. Excuse the messiness of the diagram xD</p>
<p>i put northeast for the planes (vector multiplication) and i was trying to think of the same thing Sci-Fry, that’s why it has to be lower, makes more sense</p>
<p>i wish i knew how to swim so i could confirm it right now at the pool *sigh</p>
<p>i think it’s northeast, that’s what i got when i multiplied them</p>
<p>Lol that’s the great thing about physics. If unsure, try to act it out… xD</p>
<p>BTW, for the question about the curved ramp (the one was shaped like a quarter circle), I now remember the question and what I put:</p>
<p>The question showed:</p>
<p>|O
…____</p>
<p>Pretend that it’s a ball on a circular ramp. As it rolls down the ramp, consider the following:</p>
<p>I. Force on the ball by the ramp
II. Potential Energy
III. Total Energy (I think)</p>
<p>What increases?
I said only the upward force on the ball increases (due to gravity).</p>
<p>What decreases?
I said that only potential energy decreases (as it falls to a lower height and increases PE). We assume that energy is conserved and total energy remains the same.</p>
<p>Did others put the same answers?</p>
<p>if u multiply vectors, wont the result be perpendicular which means the vector would be out of the page? not sure if that was the way to get the answer</p>
<p>also did everyone put the inversely proportional graph of force vs. distance twice (ex. the one with the parallel oppositely charged plates, when you move them further away the force goes down), but i seem to remember getting this answer for two straight questions…anyoje do the same thing?</p>
<p>@ sci-fry, agreed</p>
<p>i put northeast also</p>
<p>Hmmm. I think I put the one where there was a constant increase (linear) from one end to the other. Can’t remember the question though… Could you elaborate?</p>
<p>@ basketball1, yep i put the same for two questions but i wasnt sure</p>
<p>Yes sci-fry, i put the same answers
for the one that increases, it was more of a process of elimination for me
PE has to decrease, and total ME is constant
so i put the force, even though i didnt know why</p>