<p>grr... so which is it 2w or w</p>
<p>wat was the one with the two charged spheres and the point where the electric force woudl be pointing west...none of the answers made sense</p>
<p>for that one I put C, the point charge equidistant between the two. (tangent of the magnetic field was due west).... </p>
<p>anyone care to explain please?</p>
<p>the tension was 2w</p>
<p>shoot i read the tension problem wrong then... :(</p>
<p>the two charged spheres problem, the answer was the point equidistant from the two and above them. you can figure this out by adding the vectors, the charge is repulsed by the right charge at a 135 degree angle, and attracted by the left charge at a 225 degree angle. The magnitude of the repulsion/attraction is the same. Thus, adding the two vectors produces one vector of some random magnitude but going DIRECTLY WEST.</p>
<p>what was the answer to the relative speed one (.6C something)
One spaceship is going .6 C E. and another is going .6c W. I put .6c</p>
<p>I dont know if it was West or East BUT it was opposite directions.</p>
<p>Also what was the answer to the plane mirror question. Were is the image fromed. It had a angle mirror.</p>
<p>wait a minute, for the moon question wasn't there an answer choice about how "if you are mass m on earth, you will weigh mg/6 on the moon?" I thought that one was obvious but not i'm not so sure. </p>
<p>i just thought the three answers w/ the ball being thrown up were kinda funky.</p>
<p>mirror, i just drew the normal to the mirror and connected, the answer is B i think.</p>
<p>relativity one is faster than 0.6c and lower than c.</p>
<p>we already know that it HAS to be faster than 0.6c since they're going in opposite directions so by classical physics you have to add the velocities. However, because of time dilation, the time observed by the spaceship will be LARGER than it should, and so the velocity of the particle will seem to be LESS. How much less I didnt bother to calculate, but it has to be less than c too because any particle that goes at a speed more than c has imaginary mass.</p>
<p>images in a single plane mirror are always formed the same distance from the plane mirror as the object and straight ahead. i cant remember the ansewr choices but i think it was B?</p>
<p>KM, the answer choices you're thinking of went along the lines of "the ball's mass will be 6 times less/greater on the moon." this isn't possible since mass doesn't change (at least in classical physics it doesn't).</p>
<p>whoops, i read "mass" as "weight." </p>
<p>so that's 2 more wrong than before... darnit.</p>
<p>the tension one was definitly W</p>
<p>I'm pretty sure the tension one was 2W, but can we keep doing new questions? anyone else remember any more? :)</p>
<p>the question with hte standing wave, what was the wave "photograph" that was impossible? i was down to between B (the completely flat one) and d (the one that seemed out of phase) and I picked D because the nodes/antinodes for a standing wave need to match...</p>
<p>d is correct, the nodes were not there anymore.</p>
<p>sweet thanks ucrotcpaplc :)</p>
<p>how come it's not answer choice A?</p>
<p>all i know is that in answer choices A, B, C, and E, the nodes were still there (that is, the positions at which the wave had no amplitude remained constant). it has to be D.</p>
<p>so... was this harder/easier than the previous sat 2 physics? what do you guys think the curve will look like?</p>
<p>it felt easier. as for the curve, i have noooo idea =)</p>
<p>How about the first two questions witht he waves? can somebody clarify those???</p>
<p>Also, the question with the current conducting loop, was the particle which felt the most force the one next to the sharpest turn??</p>
<p>Does backround radiation have anything to do with expanding universe??</p>
<p>did anyone else get screwed over by timme???</p>
<p>Im pretty sure there was an answer which was like "if you are mass m on earth, you will weigh mg/6 on the moon" so i think KM000218 would be right</p>