<p>@toonlink, it was ohm’s law. V = IR. The direct relationship between V and I.</p>
<p>what were the answers for the two questions with the light bulb and circuit?</p>
<p>I think the 2nd one for the light bulb and circuit was (when B is switched on) that the Bulb gets bright and then dimmer. The negative terminal of the battery wasn’t included in the circuit at all. So the capacitor got charged when current flows. Since the capacitor is an insulator it wouldn’t let the bulb glow constantly, but the bulb will glow at first, and then start getting dimmer as the capacitor drains its charge in the form of current. I’m not sure about this one!</p>
<p>@ahmed, i got that answer for the lightbulb. What did you put for the first question on that though?</p>
<p>Back to the temperature change…</p>
<p>Ok, so let’s set up the formula. c x delta T = c2 x delta T2 (mass cancelled)</p>
<p>Let c = 1 and c2 = 2.</p>
<p>delta T = 2 x delta T2</p>
<p>Tf- 10 = 2 x (Tf-20)</p>
<p>Based on that, I put >20. Again, I don’t understand by what logic we can simply change Tf-Ti to Ti-Tf.</p>
<p>I see your point ahmed, but why not just plug in numbers if you say that only numerically we can make that assumption.</p>
<p>Just think of the change in temperature to be a positive value!</p>
<p>i put that too, that it got bright then got dimmer. what about when the switch was connected to A?</p>
<p>How would T > 20 anyway? The resulting temperature has to be between the two initial temperatures. if T>20 it implies heat was added from an external source!</p>
<p>@ahmed, you can’t assume delta T is always positive. Ah w/e. Let’s just end this argument over that question =(</p>
<p>can electrons ionize air</p>
<p>what was the question when it was connected to A? I can’t remember…</p>
<p>It just said what did the circuit do when connected to switch A. Options were: lightbulb is off, on, dim, etc…</p>
<p>Yes electrons can ionize air!</p>
<p>Oh yeah… lightbulb was off since it was connected to a capacitor… current can’t pass through it</p>
<p>I put all three for both conservation of both momentum and KE.</p>
<p>I also got 15<t<20 for the water problem.</p>
<p>Also, what’s the answer for lightbulb connected to circuit for a long time?
I got dim.</p>
<p>What did you guys get for the last question?</p>
<p>What was the last question? ><</p>
<p>yess i put that. and the one about an electron traveling east through an electric field going upward, which way did the magnetic field had to be going?</p>
<p>Also double convex lens question? Anyone?</p>
<p>Also got Ohm (the guy) for some law.</p>
<p>And for spaceship I got 0.6c (same speed as original) because of something about special relativity.</p>
<p>I know there was one about calculating the force on a particle towards the end that I think was 0, because it was traveling anti-parallel to the field lines</p>
<p>I left that blank toonlink, lack of time.
Double convex lens, I think it was same size inverted? Object was placed at 2f…</p>