November 2009 SAT II Physics - Page 5

oceanangel · 11-07-2009, 11:57 AM

Is the pv graph on isothermic or adiabatic?

oceanangel · 11-07-2009, 11:58 AM

I remember point E or something was in the same position as point B or C.

Sci-Fry · 11-07-2009, 11:58 AM

I put the one that was isothermic. I think it was C or something.

EDIT: Isothermic = Same temperature = same average kinetic energy of the molecules, so I assumed same internal engergy.

basketball1 · 11-07-2009, 11:59 AM

can anyone just sum up their answers for the velocity vs time graphs at the beg. of the test?

Pikafu · 11-07-2009, 11:59 AM

For the question about rising points on a wave:

I think point D on the wave is rising. Point A is already at its highest point, and the other points were nodes which don't move (but all this is assuming that its a standing wave). If it's not a standing wave, then I don't know if D is the right answer.

Sci-Fry · 11-07-2009, 12:00 PM

Nope, I'm pretty sure it was a traveling wave. There was an arrow pointing to the right that indicated "v", so I assumed it was moving to the right.

oceanangel · 11-07-2009, 12:01 PM

I remember it specifically said travelling wave. I made sure it's not standing wave

basketball1 · 11-07-2009, 12:03 PM

was C the one that was traveling right across the line?

oceanangel · 11-07-2009, 12:03 PM

Does anyone remember what the very very last question was?

Pikafu · 11-07-2009, 12:03 PM

mhm...

CRAP.

Also there was the one with 3 charges separated equally. There were 2 positives and one negative in the middle. There was a "net force to the left" and it asked "which charges are affected"?

I skipped that one because I had no idea how to do it based on the wording of the question.

oceanangel · 11-07-2009, 12:04 PM

It was only the charge on the right

Sci-Fry · 11-07-2009, 12:05 PM

Yep, I put the charge on the right. I think the answer was "only III" or something.

EDIT: Does anyone remember if the isothermic question (about constant internal energy) C or something else? I hope I didn't misbubble, but I saw C as the transformation that moved along the isotherm. I hope it wasn't an adiabatic transformation I was actually seeing.

oceanangel · 11-07-2009, 12:06 PM

No it asked which charge had a net force to the left, not which was AFFECTED Lol

oceanangel · 11-07-2009, 12:09 PM

Pv graph was either C or D..I hope I didn't misbubble either!

Pikafu · 11-07-2009, 12:10 PM

Screw me. I can't believe I read the question wrong argh.