**SAT 2 Physics Discussion Thread Oct 2015**

Test Preparation SAT Subject Test Preparation
21

beats question?

22

virtual image question I said that the image could be anywhere to the left because it was a a concave lens

23

question with the box from top view? plane mirror?

would both angle of refraction and angle of reflection increase when angle of incidence increases?

24

You can see a virtual image…

25

@youcanttrackthis The velocities would also be the same. 1/2mv^2=mgh for X and 1/2(2m)v^2=2mgh for Y. V in both cases are equal

26

@xolexixo55 I said anywhere to the right because the object is never supposed to be on the same side as your eye. Plus, @gegri123 , you CAN see a virtual image.

27

@didierdrogba isn’t it left though, because the light was incident from the left, the image would be produced on the right

28

No it would be an upright virtual image on the same side of the object. When you’re using a lens, you look through it, so thats why your eye would have to be on the right.

29

Yeah the velocity was a stupid mistake damn it. I’m not sure about the lens question, i drew out the Ray diagram and the image definitely forms on the left.

30

Was momentum the thing that changes as a particle undergoes centripetal acceleration? What was the nuclear fusion question?

31

@didierdrogba momentum changes because direction of velocity changes… fusion is stars

32

what was beats question…

same frequencies with different amplitudes?
or different frequencies?

33

f(beat) = | f(1) - f(2) |

34

What was the second matching part, after the upward downward acceleration part
.

35

So slightly different frequencies, but same amplitudes right?

36

Two waves can either reinforce or cancel, right?

37

In the capacitor question, was the first one only resistance and the second only capacitors. And the satellite that had the most KE and the greatest gravitational force was the last one. 2M and R one.

38

Can you separate white light using flat surface mirror? I said you couldn’t. And the list question for a planet on an elliptic orbit was II and III

39

Oh god! Please don’t discuss! I am getting even more nervous now!
Gus what do you think would be the curve? Will it be more linient? Cause I felt this test was tougher

40

I hope the curve is nicer, but honestly the questions weren’t that bad. I made loads of mistakes too, but the questions were all simple concepts and I think I just got nervy. Doubt the curve will be any more lenient than normal (where ~8 mistakes = 800)