<p>ohh…I guess it doesn’t change then.</p>
<p>so…i answered 71, and of those, got at least 3 wrong…my probability of an 800 decreases every second</p>
<p>no, time isnt the source of error it’s air resistance.</p>
<p>the question asked what would best explain the discrepancy between the theoretical value and the value he obtained, and air resistance is the only difference between how the 2 values are calculated. also you have to assume all the equipment he was using was ideal and accurate</p>
<p>but in his equation, the only actual limiting number he used was g=9.80 or 10.0. (either way, 3 sig figs)</p>
<p>so, since his times are in tenths, they have the limiting significant figures.</p>
<p>Also, his equation took into account the times, anyway.</p>
<p>I answered 72, guessed on 2, and a probably got a plethora of wrong answers…
I was very good on time, surprisingly- something that did not happen on my practice tests.
I predict a ~700, hoping to be enthusiastically surprised Feb. 14.</p>
<p>Diameter change would still mean the same gravitational force.</p>
<p>yeah. gravitiation force only depends on mass of the earth and the distance from the core.</p>
<p>Intuition told me air resistance, so I went with that.
But it is also very possible that it was the timer, since the time it takes for his reaction to press the timer may vary every time. If it had been another time of measuring device, then air resistance for sure; but I am sure it said stop watch.</p>
<p>All of you physics-takers are coming out of the shadows now lol</p>
<p>So for the tank in a room, did anyone else get 8*10^6(?) as the rate of loss of heat at 34 degrees? I’m sure the other answers were way off, like 27 and 40^something</p>
<p>you would have to be a physics beast to get the magnets-in-paper questions…</p>
<p>for the tank-in-a-room question, you just find the change in the y-axis on the graph and divide that by time?</p>
<p>I also put unchanged for the earth and moon question. As someone earlier said, the distance between the centers of the two objects isn’t changed, I believe, therefore, the force between them remains the same.</p>
<p>I’m also curious about the temperature change problem at 34 degrees C. Anyone think they got that?</p>
<p>Yeah, I think so. I got 20 degrees change per hour near the 34 degrees point, and multiplied that by the given value of heat loss.</p>
<p>i probably got a 66-67 as of now</p>
<p>wouldn’t it be funny if we beat the math II thread and somehow got 250 posts in the next few hours?</p>
<p>With you and me sticking around posting every 2 minutes we could probably do that:)</p>
<p>The elevator question:</p>
<p>As the elevator goes down, his weight would be less than his normal weight, but more than zero.</p>
<p>As the elevator does up, his weight would be more than his normal weight.</p>
<p>In free-fall, the weight would be zero.</p>
<p>And the momentum question was 5m/s in quadrant 2. Since the other particles are moving east and south with speeds 3 and 4, this has to balance out with a northwest 5 (Pythagorean Theorem).</p>
<p>Did anyone answer A) Dampening for a question on the volume of sound?</p>
<p>I put dampening.</p>