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#21 ice_illusion

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Posted 17 May 2006 - 03:36 PM

QUOTE(nathanm @ May 17 2006, 04:28 PM) View Post

QUOTE(ice_illusion @ May 17 2006, 04:27 PM) View Post

Ooh I remember that one.
I think I'll start writng down what I think I got for each and then draw it onto a grid and see how many I remember.



i circled mine on the paper so i know exactly what i got wink.gif

I did that too but we have to leave our papers if we leave early and I was going to stay but I really couldn't. I almost went back into the hall to get it but my bus came and there were still people working.

#22 charles

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Posted 17 May 2006 - 03:38 PM

QUOTE(nathanm @ May 17 2006, 04:19 PM) View Post

QUOTE(Pyrefly @ May 17 2006, 04:12 PM) View Post

I particularly didn't like the question asking what was the work done to move the proton. All I could see was the potential diff..no charge of protons. Ended up just shoveing in the charge for an electron in the hope that i will get marks for the rest of the question tongue.gif



I *think* that;s what they were expecting you to do, because there doesn't seem to be any other way to do it :S

and to start off section B..probz wrong, but;

21a] W=mgcos theta.gif =2600x9.8xcos12=24900N (to 3sf)

b] F=24900-1400=23500 F=ma implies.gif a=F/m = 23500/2600= 9.04ms-2

c] v2=u2 + 2as = 25+2x9.04x75 = 25+1356 =1381
v=37.2 (to 3sf)


1400? N-KG?


QUOTE(charles @ May 17 2006, 04:37 PM) View Post

QUOTE(nathanm @ May 17 2006, 04:19 PM) View Post

QUOTE(Pyrefly @ May 17 2006, 04:12 PM) View Post

I particularly didn't like the question asking what was the work done to move the proton. All I could see was the potential diff..no charge of protons. Ended up just shoveing in the charge for an electron in the hope that i will get marks for the rest of the question tongue.gif



I *think* that;s what they were expecting you to do, because there doesn't seem to be any other way to do it :S

and to start off section B..probz wrong, but;

21a] W=mgcos theta.gif =2600x9.8xcos12=24900N (to 3sf)

b] F=24900-1400=23500 F=ma implies.gif a=F/m = 23500/2600= 9.04ms-2

c] v2=u2 + 2as = 25+2x9.04x75 = 25+1356 =1381
v=37.2 (to 3sf)


1400? N-KG?

oh, sorry, I forgot, it was friction


#23 Fraizer

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Posted 17 May 2006 - 03:40 PM

It went quite alright actually!!

But I've done all my work in pencils, and didnt notice untill the invigulator told me.. Would they take marks off me for that? :S

#24 Pyrefly

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Posted 17 May 2006 - 03:44 PM

QUOTE
paddyb67 Posted Today, 04:36 PM
CORRECT multiple choice answers were:
1.E
2.D
3.B
4.D
5.C
6.C
7.E
8.B
9.B
10.C
11.A
12.A
13.B
14.D
15.D
16.E
17.A
18.C
19.C
20.B



If those are right...i got 18/20 biggrin.gif *dances* only that wasn't the hard part....

#25 ice_illusion

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Posted 17 May 2006 - 03:44 PM

QUOTE(nathanm @ May 17 2006, 04:27 PM) View Post

lol

22ai] impulse=area under graph = 0.5x8e-3x70 + 0.5x2e-3x70 = .28+.07 = 0.35N

ii] didnt understand that one :S

iii] or that one :S

b] or that one ohmy.gif

For one of them I did this. (If that was the ball one)
IPB Image

#26 Pyrefly

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Posted 17 May 2006 - 03:49 PM

QUOTE
21a] W=mgcos =2600x9.8xcos12=24900N (to 3sf)


Uh oh....i thought it was mgsin angel....
*looks up notes*

weight acting down = mg....
mgsin angel is the force down the plane...hmm

for me i got the answer to be...
21a) 5297.6N
b) 1.5m s-2
c) 397488J (we were calculating the kinetic energy..not the velocity like you seem to have done..

#27 Jade

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Posted 17 May 2006 - 03:49 PM

QUOTE(paddyb67 @ May 17 2006, 04:36 PM) View Post

CORRECT multiple choice answers were:
1.E
2.D
3.B
4.D
5.C
6.C
7.E
8.B
9.B
10.C
11.A
12.A
13.B
14.D
15.D
16.E
17.A
18.C
19.C
20.B


Got practically all of these right so hopefully uve got the right answers lol!


#28 Nathan

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Posted 17 May 2006 - 03:51 PM

QUOTE(Fraizer @ May 17 2006, 04:40 PM) View Post

It went quite alright actually!!

But I've done all my work in pencils, and didnt notice untill the invigulator told me.. Would they take marks off me for that? :S


probably not if your work is clear enough...ie it can be read

and ice i got that as well....but i didn;t know how to explain it an i couldnt be bothered drawin it wink.gif

and pyrefly, you're probably right...but i'll only lose 1 mark for using the wrong formula

an i think i only got 13/20 *if* those answers are right

#29 Pyrefly

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Posted 17 May 2006 - 03:51 PM

For the graph one there...
F=ma The balls had the same mass and the acceleration was 9.8 for both. So both graphs should go to 70N right?

I just guessed it was a little further back tongue.gif

#30 crazycat89

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Posted 17 May 2006 - 03:52 PM

QUOTE(Jade @ May 17 2006, 04:49 PM) View Post

QUOTE(paddyb67 @ May 17 2006, 04:36 PM) View Post

CORRECT multiple choice answers were:
1.E
2.D
3.B
4.D
5.C
6.C
7.E
8.B
9.B
10.C
11.A
12.A
13.B
14.D
15.D
16.E
17.A
18.C
19.C
20.B


Got practically all of these right so hopefully uve got the right answers lol!


hear hear, lets hope these are right , cos then ive only got 1 wrong smile.gif hopefully the rest of my answers are ok


#31 Waterreus

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Posted 17 May 2006 - 03:53 PM

QUOTE(paddyb67 @ May 17 2006, 03:36 PM) View Post

CORRECT multiple choice answers were:
1.E
2.D
3.B
4.D
5.C
6.C
7.E
8.B
9.B
10.C
11.A
12.A
13.B
14.D
15.D
16.E
17.A
18.C
19.C
20.B


Are these definitely the correct answers? If so, I got 14/20, which I'd be quite pleased with. smile.gif I normally get around ~10/20...

I hate multiple choice in Physics - 5 answers to choose from, 4 of which are only there to distract you... it annoys me to think that somebody who hasn't studied at all could GUESS most of the questions and get 18/20, whereas somebody that has studied has given his/her best effort can get far less.

It's a crap system. sad.gif

#32 ice_illusion

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Posted 17 May 2006 - 03:54 PM

Oh yeah, I might have been thinking something to do with impulse. Or wasps. dry.gif


Anyone feel like scanning it and messaging it to me? *puppy eyes*
Thanks nathan.

#33 Nathan

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Posted 17 May 2006 - 03:55 PM

QUOTE(adamcs @ May 17 2006, 04:53 PM) View Post

Are these definitely the correct answers? If so, I got 14/20, which I'd be quite pleased with. smile.gif I normally get around ~10/20...

I hate multiple choice in Physics - 5 answers to choose from, 4 of which are only there to distract you... it annoys me to think that somebody who hasn't studied at all could GUESS most of the questions and get 18/20, whereas somebody that has studied has given his/her best effort can get far less.

It's a crap system. sad.gif



i quite like the ennee meenie minee mo technique wink.gif

#34 ice_illusion

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Posted 17 May 2006 - 03:57 PM

Ok, someones sending it. Thanks.

#35 Nathan

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Posted 17 May 2006 - 04:00 PM

QUOTE(Pyrefly @ May 17 2006, 04:49 PM) View Post

QUOTE
21a] W=mgcos =2600x9.8xcos12=24900N (to 3sf)


Uh oh....i thought it was mgsin angel....
*looks up notes*

weight acting down = mg....
mgsin angel is the force down the plane...hmm

for me i got the answer to be...
21a) 5297.6N
b) 1.5m s-2
c) 397488J (we were calculating the kinetic energy..not the velocity like you seem to have done..


i went on to calculate the ek from there...just forgot to post that part...oops

#36 Michael

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Posted 17 May 2006 - 04:01 PM

component down a plain is mgsin theta.

#37 ice_illusion

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Posted 17 May 2006 - 04:01 PM

QUOTE(nathanm @ May 17 2006, 04:55 PM) View Post

QUOTE(adamcs @ May 17 2006, 04:53 PM) View Post

Are these definitely the correct answers? If so, I got 14/20, which I'd be quite pleased with. smile.gif I normally get around ~10/20...

I hate multiple choice in Physics - 5 answers to choose from, 4 of which are only there to distract you... it annoys me to think that somebody who hasn't studied at all could GUESS most of the questions and get 18/20, whereas somebody that has studied has given his/her best effort can get far less.

It's a crap system. sad.gif



i quite like the ennee meenie minee mo technique wink.gif

I prefer the "what hasn't come up in a while" technique. I know it probably doesn't work any better becuase exam setters are mean like that but it looks nicer.

#38 Nathan

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Posted 17 May 2006 - 04:02 PM

QUOTE
component down a plain is mgsin theta.


ah well :S

#39 Dr-F

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Posted 17 May 2006 - 04:05 PM

What the hell's wrong with me lol? I put down E for 1), then after about 15 mins changed it to A (as acceleration is the rate of change of velocity, which is a vector). Oh well...

Everyone who was sitting it in our class found the paper hard, much harder than the past papers we'd all become accustomed to. I was surprised there wasn't more stuff on the equations of motion, or refraction of light.

On the plus side...using the equation E = mc^2 in an exam was pretty damn gratifying lol.

#40 Nathan

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Posted 17 May 2006 - 04:07 PM

QUOTE
On the plus side...using the equation E = mc^2 in an exam was pretty damn gratifying lol.p


U not do credit maths last year then?





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