ATAR Notes: Forum
Archived Discussion => 2011 => Mid-year exams => Exam Discussion => Victoria => Physics => Topic started by: b^3 on June 14, 2011, 01:52:18 pm
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How did everyone go on this years mid-year? Exam was longer than usual but I didn't consider it hard, just found it unable to word the theory answers correctly and shall i say wasn't "on the ball" today. So what do you think of it?
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Dude WTF just happened
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Quite trickier than previous years with a few questions I wasn't certain about.
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When will we be able to find answers for the exam?
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Electronics screwed me...I walked out in tears
There goes medicine I reckon. Hope chem saves me tomorrow
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That was on a whole other level compared to 2009 and 2010. Theory questions are a bitch to do.
Basicly this was my anus before the exam --> o and after --> O
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A+ cutoff definitely lower this year
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My detailed study (Further Electronics) was bullcrap. I had to guess a couple of the MULTIPLE CHOICE questions. Everything else was pretty simple :(
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I found it quite ok. Some Further electronics qn was a bit weird though.
What about the standard electronics section?
Did you guys get 2.0A, 6.1V and 1.9W?
Also what about the LED modulation? it was just flipped over and didn't curve right?
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Time killed me. In comparison to 2009 - 2010, this one was heaps harder.
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Fist on my arse.
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It was pretty long.
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I found it quite ok. Some Further electronics qn was a bit weird though.
What about the standard electronics section?
Did you guys get 2.0A, 6.1V and 1.9W?
thats what i got, but i didnt use the graph??? heaps of people were saying they got their answers off the graph, but i got exactly what u got through using the Total Resistance they give u(3.03 ohms) throughout that section......and farken S&M was the most time consuming ever! bloody force - extension graphs took ages to find stress, strain and YM...but im fairly confident...i know i got the last spring multi choice wrong (worth 3 marks) but that whole section was from 2008 VCAA! wtf?!?!?
BTW....motion seemed too easy?
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thats what i got, but i didnt use the graph??? heaps of people were saying they got their answers off the graph, but i got exactly what u got through using the Total Resistance they give u(3.03 ohms) throughout that section......and farken S&M was the most time consuming ever! bloody force - extension graphs took ages to find stress, strain and YM...but im fairly confident...i know i got the last spring multi choice wrong (worth 3 marks) but that whole section was from 2008 VCAA! wtf?!?!?
and apparently the LED sketch was just the inverse of what they gave u..
Yeah I did same thing as you.
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Yeah the LED graph was inverted but you had to make sure that the graph at any point didn't touch the bottom( i.e. Brightness=0) because it said on the previous page that the LED never turns off.
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fml
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Well i feel a bit better over that exam now. I think i guessed all the Structures and Material multiple choice except for maybe three. But it was just so long. Very simple questions but it was time consuming
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^ if youre doing spec you'd better speed up then, physics is so much easier
finished with 30mins left, S&M as always was easy, motion was much easier than usual (perhaps messed up one of the graphs with springs), electronics was a little harder than past
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I'm suprised people found it harder!
I didn't think it was HARDER than other exams, just (a little bit) more theory based than othere exams.
Motion was ridiculously fucking easy - the first question ONLY used F=ma ! There wasn't any resisting forces at all? Free marks for the whole state, much?
For me, it seemed the only difficult part of motion was the springs stretching- three of them were straightforward but the Kinetic Energy one was a negative parabola. I misread the question and assumed the spring went straight back to it's regular position (thought the mass was removed) and so I thought it just increased as the spring contracted.
Also, for the LED Brightness question (the one on modulation), it was 2 marks. One was to get the shape/general points correct (inversed of course), the second part was to make sure that you did not actually touch the X axis because the brightness cannot reach zero no matter how low the voltage drop is because the circuit cannot break. I accidentally touched the X axis without thinking about it, so it remains to be seen whether I'll get two marks on that or not.
General electronics on the whole for me was pretty damn hard considering I didn't do it last year (I did motion unit 2, but didn't do unit 1 with electricity) so I thought it was stupid - because all of the V/I/R/P just seemed to be bizzare numbers. I'm sure I lost a few marks in this section.
S&M wasn't too bad, all you needed to do was convert the actual Y axis for the first few questions, as you were allowed to annotate the paper. The lines represented increments of 100x10^6PA (100MPa, 200MPa) etc - and then all the questions were pretty much straight 'read from the graph and multiply by a number' - quite easy if you could convert the axis.
The torque questions were also ridiculously easy.
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FML that's all I'll say FML! :(
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finished with 30mins left
I wish
I knew what to do, but didn't have the time :(
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Some of the further electronics questions I haven't seen at all.. and I also mucked up the drawing fan circuit and the power through D resistor (yea I know I'm stupid). Motion was pretty easy with the exception of the 3rd question of the spring part, I got it wrong );. Electronics is definitely harder than previous years (or I'm just very dumb today). Let's hope a lot of people got it wrong as well so mine won't be as bad..
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finished with 30mins left
I wish
I knew what to do, but didn't have the time :(
Do more practice exams, you gonna need to speed up for end of year exams or else you are fked :/
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finished with 30mins left
I wish
I knew what to do, but didn't have the time :(
Do more practice exams, you gonna need to speed up for end of year exams or else you are fked :/
I did a decent amount of them, but not timed
My reasons was that, I'm bad at physics (really), so I needed to be able to the questions in the first place, forget time
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What'd you guys get for that thermistor circuit we had to set up? 4500 ohms for the resistor, with V-out on it?
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:) Found it alright! Quite long though, relativity was a BIT different
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was question 10 a beam or a cantilever, does anyone remember
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:) Found it alright! Quite long though, relativity was a BIT different
Relativity was too much reading...
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What'd you guys get for that thermistor circuit we had to set up? 4500 ohms for the resistor, with V-out on it?
Yeap.
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Answers are here, apparently
http://www.itute.com/board/viewtopic.php?f=6&t=2414
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well my teacher never taught gravitation or projectile motion. hardly any of us finished the exam. Old c*nt spent 2 terms on centripetal force and electronics. there goes my dreams of medicine. FML :(
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shouldnt the diving board have a steel rod at the bottom for the small section at the beginning....
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that's what i thought too
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I found it quite easy and unchallenging compared to other exams.
I screwed up relativity though, didn't leave enough time for it...going to bring down my score along with other probable lost marks along the way.
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Predicting 82/90 so 91%:
-2: failed calculations in motion and forgot to check over them because spent 20 mins staring at the blocks question
-1: the LED graph was not suppose to touch 0 because it was always on
-1: too fob and couldn't explain modulation
-2: apparently the whole thing was in tension
-2: the truss question; AC (at an angle) compression, BC (hori) tension
Hopefully the A+ mark is lower than previous years :D
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I forgot to square R when doing mass of planet. FML HARD>
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omg, that could be the difference between a and A+ for me. That fucken R squared.
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A+ cutoff? I'm going with 75-80.
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Lost minimum 12 marks :(
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Shoot! just realised I ddin't pay any attention to sig figs throughout the whole exam. ah dam pressure, makes you do stupid things.
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lost atleast 15 marks argh fucking theory
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Shoot! just realised I ddin't pay any attention to sig figs throughout the whole exam. ah dam pressure, makes you do stupid things.
You won't lose marks for sig figs, unless they're like ridiculous (something like 1.343726273828191)
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Shoot! just realised I ddin't pay any attention to sig figs throughout the whole exam. ah dam pressure, makes you do stupid things.
You won't lose marks for sig figs, unless they're like ridiculous (something like 1.343726273828191)
I hope so, i didn't do nothing like that, just have to watch for chem tomorrow.
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It was pretty long.
THATS WHAT SHE SAIDDD!
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If I had 5 more minutes :(
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well my teacher never taught gravitation or projectile motion. hardly any of us finished the exam. Old c*nt spent 2 terms on centripetal force and electronics. there goes my dreams of medicine. FML :(
Woah that's just not right...
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predictions for A+ cut off?
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I think i screwed up mostly in electronics ....
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well my teacher never taught gravitation or projectile motion. hardly any of us finished the exam. Old c*nt spent 2 terms on centripetal force and electronics. there goes my dreams of medicine. FML :(
Woah that's just not right...
rowville teachers are shit and so is my luck for getting them.
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Predicting 82/90 so 91%:
-2: failed calculations in motion and forgot to check over them because spent 20 mins staring at the blocks question
-1: the LED graph was not suppose to touch 0 because it was always on
-1: too fob and couldn't explain modulation
-2: apparently the whole thing was in tension
-2: the truss question; AC (at an angle) compression, BC (hori) tension
Hopefully the A+ mark is lower than previous years :D
so arrogant
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But seriously speaking, without A+ on this 40 is out of the question yeah?
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Nup, i got an A for exam 1 and still managed a 40
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sigh...did the stupidest mistake. Placed Vout over the thermistor T-T
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oh mad!
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That was surprisingly easy. If you knew your theory, you would've aced it. No real challenging questions if you compare them to exams in previous years.
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That was surprisingly easy. If you knew your theory, you would've aced it. No real challenging questions if you compare them to exams in previous years.
Indeed
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lol ur r squared Bozo....i got the mass for the planet as ~167kg! must've used 6.67 x 10^+11 instead of -11...consequential mark hopefully?,..
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FML lol
Nah i might get one mark for working we'll see. and you didn't need the mass of the planet for the next question.
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Can u get a 38 raw with three As?
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FML lol
Nah i might get one mark for working we'll see. and you didn't need the mass of the planet for the next question.
yeh thank god for that, ill be happy with an A i think, we'll see how the cut-off goes....Pretty confident though, the rank 1 student in our school got the voltage divider q wrong! (used 500 ohm) i got that one right (after like 20mins and 4 different drawings)...i think some would say the exam was overall fairly easy, but there were a couple of q's that would have stopped the top students from getting full marks i reckon..
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Ele photo
Q2 I(B)=2 A
Q3 V(A)=6 V
Q4 P(D)=2 W
these are itute's E&P first section answers, would 1.97 A, 6.1V and 1.94W be accepted???
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Ele photo
Q2 I(B)=2 A
Q3 V(A)=6 V
Q4 P(D)=2 W
these are itute's E&P first section answers, would 1.97 A, 6.1V and 1.94W be accepted???
Probably. I'm assuming you used 3.3 instead of 10/3 yes?
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yeah i believe so
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ye....3.33 to make sure lol
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omg for the angel of the banked track i wasn't thinking my friend said it wasn't that standard theta=arctan(v^2/gr) can anyone confirm? :(
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hey i was wondering...my friend said that you need to full mark both physics exams to get a 50. is this true? o.O
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omg for the angel of the banked track i wasn't thinking my friend said it wasn't that standard theta=arctan(v^2/gr) can anyone confirm? :(
nah it is right...i don't know what your friend was on :P
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omg for the angel of the banked track i wasn't thinking my friend said it wasn't that standard theta=arctan(v^2/gr) can anyone confirm? :(
nah it is right...i don't know what your friend was on :P
OMG thank you i think he got the something similar but i just walked away when he said i was wrong, didn't wanna get psyched out for accounting haha
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Ele photo
Q2 I(B)=2 A
Q3 V(A)=6 V
Q4 P(D)=2 W
these are itute's E&P first section answers, would 1.97 A, 6.1V and 1.94W be accepted???
probably but you really should have used exact values.
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100% VCAA 2009 in 37 mins.....
99% VCAA 2010 in 56 mins....
≈85% VCAA 2011 barely finishing on time...
Why couldn't I have done physics last year :(
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Can anyone remember question 1?
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Yes, answer was 1250 N. F=ma = 2500x0.5 = 1250 N
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Can anyone remember question 1?
I remember all you had to do was use F=ma=(2500)(0.5)=1250
I was surprised at how easy Q1 was.
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Can anyone remember question 1?
I remember all you had to do was use F=ma=(2500)(0.5)=1250
I was surprised at how easy Q1 was.
i was like SCORE!!! this exam's gonna be a breeze. i jinxed myself
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for the momentum question, im guessing EK was conserved from A to C, therefore velocity at C = velocity at the bottom of the hill??
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for the momentum question, im guessing EK was conserved from A to C, therefore velocity at C = velocity at the bottom of the hill??
indeed.
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Can anyone remember question 1?
I remember all you had to do was use F=ma=(2500)(0.5)=1250
I can't remember but did you use the whole systems mass? just to be sure D:
I was surprised at how easy Q1 was.
i was like SCORE!!! this exam's gonna be a breeze. i jinxed myself
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lol
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thankgod, cant wait for some worked solutions....
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That was surprisingly easy. If you knew your theory, you would've aced it. No real challenging questions if you compare them to exams in previous years.
Bullshit! It wasn't necessarily ridiculously hard, but much much harder than previous years.
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RAN OUT OF TIME! As did most people in my class.
And forgot how to do apparent weightlessness.
Shame'd so hard, leaving that exam was like this: http://www.youtube.com/watch?v=bZLamQWlqJA
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OMFG
Placed Vout over the resistor BUT I used 500ohms....
NOOOOO
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Will you get any of the 3 marks for that?
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Will you get any of the 3 marks for that?
Hope so...
At least 1
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I made the exact same mistake, I think we'll get two marks/3. Seeing as the only mistake we mate was the wrong resistor value?
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I drew Vout over the thermistor, and the 500ohm resistor... are we not allowed to do that??
Cause it'd still work, right?
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I drew Vout over the thermistor, and the 500ohm resistor... are we not allowed to do that??
Cause it'd still work, right?
thats what i did, it looks right at first, but when u decrease/increase the temperature.... =(
how many marks do we get if we drew vout over thermistor and used a 500ohm resistor?
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I drew Vout over the thermistor, and the 500ohm resistor... are we not allowed to do that??
Cause it'd still work, right?
thats what i did, it looks right at first, but when u decrease/increase the temperature.... =(
how many marks do we get if we drew vout over thermistor and used a 500ohm resistor?
I did the same thing. I reckon we might get 1 mark which would be reasonable since we didn't quite grasp the concept.
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Sounds like scaling will be greatly in everyonrs favour this year
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oh crap.... I did it for temp's LESS than 20degrees, I even checked what wound happen if the temp. went BELOW 20 degrees :'(
bugger.
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Sounds like scaling will be greatly in everyonrs favour this year
How so?
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Anyone know when the results are released???
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Mid August I think.
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Sounds like scaling will be greatly in everyonrs favour this year
How so?
From what I have heard here and elsewhere, even many of the more capable students didn't even finish/ get all the marks they could, and as an overall comparison to other years, the spread seems more balanced to the lower end, hence more scaling.
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I'm surprised at how bad people think it went. Motion was extremely easy, breezed through it. Gravity was a joke, Kepler's Law was all you needed and bam, free marks. Electricity was kind of tricky though, I accidently put the VOUT on the Thermistor and used 4500ohms. Damn, hopefully some marks. Oh, and I used pencil to draw the graph, hopefully it comes out properly when it gets scanned. :'(
What did people get for the mesh on the diving board? It wasn't very specific whether the board was actually connected in place between A and B. So it was either mesh on the entire top of the board, or little bit at bottom, rest at top.
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For some reason I completely assumed it was connected at B, so I put the answer that had most of it at the top and a little at the bottom on the left..
It doesnt state 'how' B supports it?!
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The question asking to choose and explain the graph representing the total spring potential energy was tricky
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^yeh, and if u did VCAA 2008 exam recently, u would have chosen the wrong graph for the 3 mark question - what i did lol....apparently VCAA loves doing that
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I said the total spring potential energy was directly proportional to x^2, but I chose the half inverted parabola. Hopefully I get at least 1 mark for the explanation.
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for that three mark question about the spring potential would you lose all marks for explaining the wrong graph?
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OKay guys i have something BIG to tell you... my physics teacher is a total genius and what he says is right and today he told us that the modulation graph was the same as the one given, only inversed AND DOES NOT TOUCH THE X-AXIS, SINCE THE LED STAYS SWITCHED ON THE WHOLE TIME (SO THE BRIGHTNESS CAN NEVER BE 0). i dont know how he saw that one coming.
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In relation to the thread question, I think my new SS aim for physics (see my sig) says how I did :(
OKay guys i have something BIG to tell you... my physics teacher is a total genius and what he says is right and today he told us that the modulation graph was the same as the one given, only inversed AND DOES NOT TOUCH THE X-AXIS, SINCE THE LED STAYS SWITCHED ON THE WHOLE TIME (SO THE BRIGHTNESS CAN NEVER BE 0). i dont know how he saw that one coming.
Yeh, I was surprised I actually got that. One of the few things i DID actually get...
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For the brightness graph, if you drew a curvy instead of straight wave, but everything else was right (it was inverted and above 0) will you still get 1 mark out of the two?
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For the brightness graph, if you drew a curvy instead of straight wave, but everything else was right (it was inverted and above 0) will you still get 1 mark out of the two?
Yes I think so.
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For the brightness graph, if you drew a curvy instead of straight wave, but everything else was right (it was inverted and above 0) will you still get 1 mark out of the two?
Maybe even 2/2, it was technically curvy (if you perform the calcs from P=VI you see that you get a curvy graph with cusps). But VCAA will pay both (if your curvy one was cusped).
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god burn vcaa in hell, after that exam...
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god burn vcaa in hell, after that exam...
I share those sentiments
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That was surprisingly easy. If you knew your theory, you would've aced it. No real challenging questions if you compare them to exams in previous years.
SUUUUUUUUDDDDIIIIISSHHHHH!!!!!!
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hey i was wondering...my friend said that you need to full mark both physics exams to get a 50. is this true? o.O
This is not true, last year 16 people got 50s and only 6 people got 100% on the unit 3 and that was an easier exam
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For the brightness graph, if you drew a curvy instead of straight wave, but everything else was right (it was inverted and above 0) will you still get 1 mark out of the two?
Maybe even 2/2, it was technically curvy (if you perform the calcs from P=VI you see that you get a curvy graph with cusps). But VCAA will pay both (if your curvy one was cusped).
It would only be very, very mildly curvy though I think.
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hey i was wondering...my friend said that you need to full mark both physics exams to get a 50. is this true? o.O
This is not true, last year 16 people got 50s and only 6 people got 100% on the unit 3 and that was an easier exam
Yeah, even in 2009 I doubt you needed full marks on both exams to get 50. I got 50 with rank 1, but didn't get a premiers, so I'm presuming that you could drop a mark on the second exam to get a 50, despite the uber high marks scored that year.
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The structures and material question about the cylinder, what stress was it under? Definitely not plastic or elastic which leaves shear or tension? I was inclined to put shear but convinced myself it was tension at the time because it replicated a pulley system which is under tension from the rope. The dux of physics last year at my school also agreed.
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26 minutes to go finished materials and motion only electronics left. First question begin reading... 20 minutes later falling to pieces because i can't do. Skip do some questions quickly the rest cannot do because it messed with my head. I hate that question so much. Unit 4 exam prep begins now.
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sigh...did the stupidest mistake. Placed Vout over the thermistor T-T
Funny thing is, that I changed my diagram (got it right) and forgot to change my calculations for R accordingly. Lucky to get one mark for that, if any...
FAIL.
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The structures and material question about the cylinder, what stress was it under? Definitely not plastic or elastic which leaves shear or tension? I was inclined to put shear but convinced myself it was tension at the time because it replicated a pulley system which is under tension from the rope. The dux of physics last year at my school also agreed.
I said tension but it has been generally accepted that the answer was shear, so yeah. :/
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It was sooooo long...enough said :P