2005 Exam 1

rabdog · 31 Oct 2005, 5:58 PM

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How'd you all go?
i've got a copy of the exam that i can scan if you guys like?
hardest questions?
1. D X
2. D
3. C
4. D
5. E
6. D
7. E X
8. C
9. B
10. B ???
11. A
12. C
13. A
14. A
15. D
16. E
17. D
18. A
19. B
20. D ???
21. B
22. B
23. C
24. E
25. A
26. C
27. E
28. B ???
29. C
30. B

Q.10
Which one of the following relations does NOT represent a circle on the argand diagram?
I picked B. |z-1| + |z+1| = 3 Because i thought it was a line
Right or wrong?

Q.20
A particle travels in a straight line with velocity v at time t.
If the velocity of the particle is given by v = 2 / sqrt(1 - x^2), for 0 < x < 1, then the acceleration is given by?
I picked D. 2x / (1-x^2)^2
Right or wrong?

A body of mass 10kg, at rest on a rough horizontal surface, is acted on by a force of magnitude 14N acting at an angle of 30 degrees to the horizontal. If the body is on the point of moving, the coefficient of friction between the body and the surface is equal to?
I picked B. sqrt(3)/14
Right or wrong?

I'd like working too thanku

Also i think i got full marks for short answer except for 3b. where i cant remember what i did.

kiosk · 31 Oct 2005, 6:41 PM

question 10.) B

the answer is B...because its a straight line (multiply out)

question 20.) E

question 28.) A

if you want the solutions...i can send it to you..its kinda hard typing it in here...

i got 2.) 5.) 9.) wrong due to silly mistakes....
and i stuffed up a bit in short answer...

or else the rest went fine
bye bye A+

anyway gl with ur 2nd exam!

zlks · 31 Oct 2005, 6:43 PM

scan please

Q10 was |z-1| + |z+1| = 3 because that is an elipse, not a circle

Q20 cant remember

the last one, sqrt3 / 14 was right

kiosk · 31 Oct 2005, 6:47 PM

also.... the last question for short answer...

did anyone get a whole number??

because if you use their 0.41 friction rather than your exact answer
you get a decimal value answer....

is that acceptable?? to use 0.41 rather than ur exact??

i gave it in exact form T = something - 0.41(something)
rather than expressing it to decimal places...
would i be marked wrong??

kiosk · 31 Oct 2005, 6:52 PM

hey zlks...how did u get B for question 28.)???

coz i got something like (7(3)^(0.5)) / 91 which = (3)^0.5 / 13

and q10.) yea B was an elipse, not a straight line

rabdog · 31 Oct 2005, 6:56 PM

what is the answer to 28? someone said A and someone said B??
how is the answer to 20. E?

if you differentiate you get dv/dx = 2x / (1 - x^2)^(3/2)
and dv/dx is not acceleration
v * dv/dx ios acceleration
and v = 2 / sqrt(1 - x^2)

so v * dv/dx = 4x / (1 - x^2)^2 .:. C is correct
Fuck fuck fuck.
I wish i could have remember that in the exam

just thought of it then.
I guess not many students would have got that correct since you guys didnt

havent seen anyone that got it right yet

kiosk · 31 Oct 2005, 6:58 PM

shit...ur rite...

im so screwed

rabdog · 31 Oct 2005, 7:07 PM

its ok

those were good distractors im sure most capable students got it wrong.. and maybe a few not so good students guessed it. lol

kiosk · 31 Oct 2005, 7:12 PM

hey so would putting down a decimal place rather than an exact be accepted for the last question asking for Tension.

they didnt ask for decimal or exact...

but i use 0.41 from their previous answer and got a decimal
if you keep it in exact form ...you are suppose to get 81 exact...

Baiku · 31 Oct 2005, 7:12 PM

As posted elsewhere:

Multiple choice:
1e 2d 3c 4d 5e
6d 7a 8c 9b 10b
11a 12c 13a 14a 15d
16e 17d 18a 19b 20c
21b 22b 23c 24e 25a
26c 27e 28a 29c 30b

Short answer:
1.a C = -3
1.b Graph
2.a K = -2
3.a show perpendicular, so x=4
3.b u = 5i + 2j + 3k
4.a v(12) = 8
4.b t=36.6 seconds
5.a show u=0.41
5.b T = 81 newtons

For Q28 - There are two arguments. That the force is a "push" or a "pull" if you used a pull, answer is A, if you used a push, answer is C. The answer is B if you didn't consider the change in N due to the force, so B is ALWAYS wrong.

I think the most arguable answer is by far A, but my friend is really pushing C still :P

Baiku · 31 Oct 2005, 7:13 PM

Quote:

Originally Posted by kiosk

hey so would putting down a decimal place rather than an exact be accepted for the last question asking for Tension.

they didnt ask for decimal or exact...

but i use 0.41 from their previous answer and got a decimal
if you keep it in exact form ...you are suppose to get 81 exact...

A decimal is acceptable, otherwise the question would be consequential, which VCAA avoids. The decimal is given in the information so that students that can't solve 5.a still have a reasonable chance at getting the answer for 5.b.
They therefore have to accept a solution to 2 decimal places for 5.b.

kiosk · 31 Oct 2005, 7:17 PM

does anyone know what was the mark required to get an A+ for previous years?? a 45?? a 46??

damn everyone is gettin smarter...

MJWOOSHA · 31 Oct 2005, 7:34 PM

Quote:

Originally Posted by rabdog

How'd you all go?
i've got a copy of the exam that i can scan if you guys like?
hardest questions?
1. D X
2. D
3. C
4. D
5. E
6. D
7. E X
8. C
9. B
10. B ???
11. A
12. C
13. A
14. A
15. D
16. E
17. D
18. A
19. B
20. D ???
21. B
22. B
23. C
24. E
25. A
26. C
27. E
28. B ???
29. C
30. B

Q.10
Which one of the following relations does NOT represent a circle on the argand diagram?
I picked B. |z-1| + |z+1| = 3 Because i thought it was a line
Right or wrong?

Q.20
A particle travels in a straight line with velocity v at time t.
If the velocity of the particle is given by v = 2 / sqrt(1 - x^2), for 0 < x < 1, then the acceleration is given by?
I picked D. 2x / (1-x^2)^2
Right or wrong?

A body of mass 10kg, at rest on a rough horizontal surface, is acted on by a force of magnitude 14N acting at an angle of 30 degrees to the horizontal. If the body is on the point of moving, the coefficient of friction between the body and the surface is equal to?
I picked B. sqrt(3)/14
Right or wrong?

I'd like working too thanku

Also i think i got full marks for short answer except for 3b. where i cant remember what i did.

u got the copy of the short answer too Rabdog.If u do can ya scan it i need to check if i screwed up lol. How u think u all wait.Easier or Harder than previous years. Did anyone get 81.6 or somethin for the last. Hope they accept decimal

Baiku · 31 Oct 2005, 7:39 PM

Quote:

Originally Posted by kiosk

does anyone know what was the mark required to get an A+ for previous years?? a 45?? a 46??

damn everyone is gettin smarter...

2004 Paper 1, 91/100 was an A+, that's a 46/50.

I think this year it'll be a bit lower, 45/50 should get you there in my opinion.

MJWOOSHA · 31 Oct 2005, 7:39 PM

Quote:

Originally Posted by kiosk

does anyone know what was the mark required to get an A+ for previous years?? a 45?? a 46??

damn everyone is gettin smarter...

think it was a 44 or 45 but u guys are scarin me lol. Might go up.But then again most people on here will be getting great scores

31 Oct 2005, 5:58 PM	#1 (permalink)
rabdog ert HSC: N/A Gender: Undisclosed Location: asd Join Date: Mar 2005 Posts: 171 Last Activity: 27 Jan 2009, 3:27 PM	2005 Exam 1 You can hide this advertisement by registering. How'd you all go? i've got a copy of the exam that i can scan if you guys like? hardest questions? 1. D X 2. D 3. C 4. D 5. E 6. D 7. E X 8. C 9. B 10. B ??? 11. A 12. C 13. A 14. A 15. D 16. E 17. D 18. A 19. B 20. D ??? 21. B 22. B 23. C 24. E 25. A 26. C 27. E 28. B ??? 29. C 30. B Q.10 Which one of the following relations does NOT represent a circle on the argand diagram? I picked B. \|z-1\| + \|z+1\| = 3 Because i thought it was a line Right or wrong? Q.20 A particle travels in a straight line with velocity v at time t. If the velocity of the particle is given by v = 2 / sqrt(1 - x^2), for 0 < x < 1, then the acceleration is given by? I picked D. 2x / (1-x^2)^2 Right or wrong? A body of mass 10kg, at rest on a rough horizontal surface, is acted on by a force of magnitude 14N acting at an angle of 30 degrees to the horizontal. If the body is on the point of moving, the coefficient of friction between the body and the surface is equal to? I picked B. sqrt(3)/14 Right or wrong? I'd like working too thanku Also i think i got full marks for short answer except for 3b. where i cant remember what i did. Last edited by rabdog; 31 Oct 2005 at 6:13 PM.

31 Oct 2005, 6:43 PM	#3 (permalink)
zlks New Member HSC: 2005 Gender: Male Location: Melbourne Join Date: Oct 2005 Posts: 24 Last Activity: 11 Jun 2007, 9:27 AM	scan please Q10 was \|z-1\| + \|z+1\| = 3 because that is an elipse, not a circle Q20 cant remember the last one, sqrt3 / 14 was right __________________ ... it's hard to stay mad, when there's so much beauty in the world. Sometimes I feel like I'm seeing it all at once, and it's too much, my heart fills up like a balloon that's about to burst... And then I remember to relax, and stop trying to hold on to it, and then it flows through me like rain and I can't feel anything but gratitude for every single moment of my stupid little life... You have no idea what I'm talking about, I'm sure. But don't worry... you will someday.

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31 Oct 2005, 6:41 PM	#2 (permalink)
kiosk New Member HSC: 2005 Gender: Male Join Date: Oct 2005 Posts: 23 Last Activity: 9 Feb 2007, 2:53 AM	question 10.) B the answer is B...because its a straight line (multiply out) question 20.) E question 28.) A if you want the solutions...i can send it to you..its kinda hard typing it in here... i got 2.) 5.) 9.) wrong due to silly mistakes.... and i stuffed up a bit in short answer... or else the rest went fine bye bye A+ anyway gl with ur 2nd exam!

31 Oct 2005, 6:47 PM	#4 (permalink)
kiosk New Member HSC: 2005 Gender: Male Join Date: Oct 2005 Posts: 23 Last Activity: 9 Feb 2007, 2:53 AM	also.... the last question for short answer... did anyone get a whole number?? because if you use their 0.41 friction rather than your exact answer you get a decimal value answer.... is that acceptable?? to use 0.41 rather than ur exact?? i gave it in exact form T = something - 0.41(something) rather than expressing it to decimal places... would i be marked wrong??

31 Oct 2005, 6:52 PM	#5 (permalink)
kiosk New Member HSC: 2005 Gender: Male Join Date: Oct 2005 Posts: 23 Last Activity: 9 Feb 2007, 2:53 AM	hey zlks...how did u get B for question 28.)??? coz i got something like (7(3)^(0.5)) / 91 which = (3)^0.5 / 13 and q10.) yea B was an elipse, not a straight line

31 Oct 2005, 6:56 PM	#6 (permalink)
rabdog ert HSC: N/A Gender: Undisclosed Location: asd Join Date: Mar 2005 Posts: 171 Last Activity: 27 Jan 2009, 3:27 PM	what is the answer to 28? someone said A and someone said B?? how is the answer to 20. E? if you differentiate you get dv/dx = 2x / (1 - x^2)^(3/2) and dv/dx is not acceleration v * dv/dx ios acceleration and v = 2 / sqrt(1 - x^2) so v * dv/dx = 4x / (1 - x^2)^2 .:. C is correct Fuck fuck fuck. I wish i could have remember that in the exam just thought of it then. I guess not many students would have got that correct since you guys didnt havent seen anyone that got it right yet

31 Oct 2005, 6:58 PM	#7 (permalink)
kiosk New Member HSC: 2005 Gender: Male Join Date: Oct 2005 Posts: 23 Last Activity: 9 Feb 2007, 2:53 AM	shit...ur rite... im so screwed

31 Oct 2005, 7:07 PM	#8 (permalink)
rabdog ert HSC: N/A Gender: Undisclosed Location: asd Join Date: Mar 2005 Posts: 171 Last Activity: 27 Jan 2009, 3:27 PM	its ok those were good distractors im sure most capable students got it wrong.. and maybe a few not so good students guessed it. lol

31 Oct 2005, 7:12 PM	#9 (permalink)
kiosk New Member HSC: 2005 Gender: Male Join Date: Oct 2005 Posts: 23 Last Activity: 9 Feb 2007, 2:53 AM	hey so would putting down a decimal place rather than an exact be accepted for the last question asking for Tension. they didnt ask for decimal or exact... but i use 0.41 from their previous answer and got a decimal if you keep it in exact form ...you are suppose to get 81 exact...

31 Oct 2005, 7:12 PM	#10 (permalink)
Baiku Coolest Member HSC: 2005 Gender: Male Location: Melbourne Join Date: May 2005 Posts: 406 Last Activity: 15 Mar 2010, 1:24 PM	As posted elsewhere: Multiple choice: 1e 2d 3c 4d 5e 6d 7a 8c 9b 10b 11a 12c 13a 14a 15d 16e 17d 18a 19b 20c 21b 22b 23c 24e 25a 26c 27e 28a 29c 30b Short answer: 1.a C = -3 1.b Graph 2.a K = -2 3.a show perpendicular, so x=4 3.b u = 5i + 2j + 3k 4.a v(12) = 8 4.b t=36.6 seconds 5.a show u=0.41 5.b T = 81 newtons For Q28 - There are two arguments. That the force is a "push" or a "pull" if you used a pull, answer is A, if you used a push, answer is C. The answer is B if you didn't consider the change in N due to the force, so B is ALWAYS wrong. I think the most arguable answer is by far A, but my friend is really pushing C still :P

31 Oct 2005, 7:17 PM	#12 (permalink)
kiosk New Member HSC: 2005 Gender: Male Join Date: Oct 2005 Posts: 23 Last Activity: 9 Feb 2007, 2:53 AM	does anyone know what was the mark required to get an A+ for previous years?? a 45?? a 46?? damn everyone is gettin smarter...