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How It Go? - HSN forum - Page 2

# How It Go?

211 replies to this topic

### #21ice_illusion

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Posted 17 May 2006 - 03:36 PM

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

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

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

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.

### #22charles

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Posted 17 May 2006 - 03:38 PM

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

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

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

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 =2600x9.8xcos12=24900N (to 3sf)

b] F=24900-1400=23500 F=ma 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)

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

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

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

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 =2600x9.8xcos12=24900N (to 3sf)

b] F=24900-1400=23500 F=ma 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

### #23Fraizer

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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

### #24Pyrefly

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Posted 17 May 2006 - 03:44 PM

QUOTE
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 *dances* only that wasn't the hard part....

### #25ice_illusion

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Posted 17 May 2006 - 03:44 PM

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

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

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

### #26Pyrefly

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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..

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Posted 17 May 2006 - 03:49 PM

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

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!

### #28Nathan

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Posted 17 May 2006 - 03:51 PM

QUOTE(Fraizer @ May 17 2006, 04:40 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

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

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

### #29Pyrefly

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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

### #30crazycat89

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Posted 17 May 2006 - 03:52 PM

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

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

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 hopefully the rest of my answers are ok

### #31Waterreus

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Posted 17 May 2006 - 03:53 PM

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

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. 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.

### #32ice_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.

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

### #33Nathan

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Posted 17 May 2006 - 03:55 PM

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

Are these definitely the correct answers? If so, I got 14/20, which I'd be quite pleased with. 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.

i quite like the ennee meenie minee mo technique

### #34ice_illusion

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Posted 17 May 2006 - 03:57 PM

Ok, someones sending it. Thanks.

### #35Nathan

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Posted 17 May 2006 - 04:00 PM

QUOTE(Pyrefly @ May 17 2006, 04:49 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..

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

### #36Michael

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Posted 17 May 2006 - 04:01 PM

component down a plain is mgsin theta.

### #37ice_illusion

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Posted 17 May 2006 - 04:01 PM

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

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

Are these definitely the correct answers? If so, I got 14/20, which I'd be quite pleased with. 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.

i quite like the ennee meenie minee mo technique

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.

### #38Nathan

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Posted 17 May 2006 - 04:02 PM

QUOTE
component down a plain is mgsin theta.

ah well :S

### #39Dr-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.

### #40Nathan

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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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