<p>the time it takes for the other one to drop is sqrt(2h/g) because
h = Vt + 1/2aT^2 times the Velocity of the other ball (answer E). Thats the distance of separation.</p>
<p>oh yaaaaaaaa i just remembered that formula on the last minute and put down E also!!!!!!!!!!
here's another problem: what was the one with the bulb, battery and resistor? the one that asks us where to put the ammeter(or voltmeter??) to measure the current? (or volt?)</p>
<p>I think it was a voltmeter</p>
<p>Thanks Ares !
The voltmeter should be placed in parallel, right?</p>
<p>That's what I put. I guess it makes sense because if the voltmeter was in series, then it would affect the voltage or something. Someone let me know if I'm wrong.</p>
<p>It should be placed in parallel because voltage is constant in parallel circuits (whereas current is constant in series circuits).</p>
<p>and a volt meter is like resistor that's 100000000000 ohms, so you can't connect it in series or else there would not be a current running through it. The voltmeter should be parallel to the bulb, and not around the resistor or the battery, I think one of the answers was that so...</p>
<p>um... u guys. there were two choices for parellel: parallel to the battery OR parallel to the Bulb.............so it's bulb right? (parallel to the battery doesn't make sense)</p>
<p>It's parallel to the bulb.</p>
<p>what about the very last question? Isn't momentum conserved under ANY circumstance? or is it only when there are no external forces?</p>
<p>What's the answer to that Qaisar thing where it was like billions lightyears away from Earth...</p>
<p>exception of external forces, and the quasar one I said it was like, really old, or something, answer A, beginning of the universe or something.</p>
<p>one of the qs said something about what the Rt was equal to, and they had a picture of R1 and R2...the answer was that Rt =the sum of R1+ R2, right?</p>
<p>THat one with momentum, I said as long as there are no external forces, but I also thought the one that said "as long as total mechanical energy is conserved, momentum is conserved" was right...I hope it was the external force one.</p>
<p>its the external forces, energy can be lost as a result of internal forces (like an explosion). I also think I remember R1+R2 because it was in series or something.</p>
<p>wasn't the R1+R2 the vectors? or was that the math test... arrr...</p>
<p>R1 and R2 were resistors, i believe</p>
<p>I put R1>R2>RT, because the resistors were in parallel, so it's 1/Rt=1/R1+1/R2, right?</p>
<p>oooooo ya, thats what I put too.</p>
<p>Were they in parallel, or were they in series?</p>
<p>yes!! i think they were in parallel</p>