June SAT: Subject Test Physics Post-Test Discussion Thread

Archive SAT Subject Test Preparation
81

<p>ˆyes. I put that the resistance is only affected by length and cross sectional area. Temperature affects it too because length changes with temperature right? :(</p>

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<p>What did you guys put for the Q+, Q- question that asked where the net force would be zero, I put nowhere because if the Q+ was repelling a particle the Q- would be drawing it in and vice versa so there cant be an area where the net electrical force is zero</p>

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<p>I don’t think temp affects it… I could be wrong</p>

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<p>Any idea with thee superconductivity?</p>

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<p>^low temperature electronic devices</p>

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<p>I would also like to know the answer to MitDuke’s question as well as which particles were moving right?</p>

<p>And resistance is proportional to cross-sectional areas and length, not temperature. But temperature does affect resistance. I cant remember if the question asked for “what affects resistance or what is proportional to resistance?”</p>

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<p><a href=“http://electron9.phys.utk.edu/phys136d/modules/m4/images/dipole.gif[/url]”>http://electron9.phys.utk.edu/phys136d/modules/m4/images/dipole.gif&lt;/a&gt;&lt;/p&gt;

<p>So this helps answers my question.
Net force is 0 at NO points.
Points moving right are those on outsides?</p>

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<p>Yes exactly, so for the ones with the wavelength graphs at the beginning, the one with the longest wavelength was the 1/4 of 360 graph, the other ones I don’t remember, DO you guys recall.</p>

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<p>Why was it -12 J and not 12 J?</p>

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<p>change in internal engery=heat added - work done by system.</p>

<p>there was more work done than heat added</p>

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<p>jollybjolly get a life</p>

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<p>

what about the diverging lens??</p>

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<p>because the image was behind the mirror. If it was infront it would have been the lens</p>

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<p>So was the answer to the distance from adult to childs image 10.75 cm? anyone else gget that?</p>

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<p>Yes, I got that cortana… definitely right… it was 10.5 i think btw, 10.75 wasnt a choice?</p>

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<p>yea 10.5. 10.75 wasn’t a choice but i forgot the exact number until now</p>

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<p>question said object traveling for 2.5 hours covered 4 meters, then o.5 hours and some more distance (cant remember exact number), what was average speed? does 2.8 sound familiar? other choices were 2.0 and 3.6 I think…</p>

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<p>2.8 sounds right? </p>

<p>I remember it was total distance/total time.</p>

<p>Does anybody remember which graph had the greatest change in momentum?</p>

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<p>wait. i think i got 2.0…since the other distance was 2 meters, and 3 hours total…so 6/3 = 2…right?
and greatest change in momentum would be the graph with the largest area underneath, since change in momentum is impulse, which is Ft</p>

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<p>Ya I remember 6/3 now that you say that. AND YUS! I had absolutely no I idea and I’m literally like “this graph looks nice” so I picked it. Lol. Physics was definitely difficult. Do you guys think -16 will be 800 like the released test?</p>