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Multiple choice answers (1 Viewer)

mR sinister

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5) is C
F = GmM- d^2

You guys have to realize.. Distance DOES NOT CHANGE!
if distance would change with orbits, and due to eclipses, then why is the value of the distance from the Earth to the Moon, or the distance from the earth to the sun a constant, i.e 1 AU
Ok wait, i read the above post... hmm good point lol ok, im sticking with B and C now :D

Also, What was the correct answer for 11?

i didnt do soo bad, 11/15 considering i guessed the last 3 ran out of time (left MC till last)

ohh, and i might sound like a noob, but what does FML mean
 
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kieranjackson91

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awesome ty..
It is in my interests for the answer to be B because thats what i put, but I heard from my physics teacher that it is C. He says the force exerted does not change because the earth is there. and also lunar elipses dont happen every time the moon orbits the earth (dont they happen every 28 days hence moon cycle), so the question is asking what happens when the earth is exactly in between. therefore radius does not need to be worried about, so nothing changes the force exerted by the sun. I hope my teacher's wrong though :mad1:
 

kieranjackson91

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5) is C
F = GmM- d^2

You guys have to realize.. Distance DOES NOT CHANGE!
if distance would change with orbits, and due to eclipses, then why is the value of the distance from the Earth to the Moon, or the distance from the earth to the sun a constant, i.e 1 AU

Also, What was the correct answer for 11?

i didnt do soo bad, 11/15 considering i guessed the last 3 ran out of time (left MC till last)

ohh, and i might sound like a noob, but what does FML mean
11 we got B. and fml means F my life
you noob lol.
 

08joel08

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A majority say B.

Reasoning
-the question does not give any information on the distances between the sun moon and earth

-the course does not provide information on the relative distance between the three in different cycles and phases

-the course specifies that gravity CANNOT be sheilded



therefore the answer to question 5 is (c)

(also the reasoning provided involving AU is wrong, AU is an average distance, and the distance between the earth and sun is definitly NOT constant)
 
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slamduncs

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Tbh if 5 is B I think that's a pretty poorly worded question. It didn't ask how the gravitational pull differed in relation to what. I took the question as meaning whether or not the positioning on the Earth between the Sun and the Moon would have a direct effect on Suns pull on the moon. Ofc it doesn't as that would be ridiculous so I wrote C. However the people saying B are saying that the Sun's pull on the moon is at a minimum when the moon is behind the Earth (ie max distance). Tbh I don't think that was what the question was asking (from a logical pov) but I wouldn't be surprised if B was the answer.
 

Ostentatious

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-the question does not give any information on the distances between the sun moon and earth

-the course does not provide information on the relative distance between the three in different cycles and phases

-the course specifies that gravity CANNOT be sheilded



therefore the answer to question 5 is (c)

(also the reasoning provided involving AU is wrong, AU is an average distance, and the distance between the earth and sun is definitly NOT constant)
The course also says that Force due to gravity exerted by any object on another is equal to (Gm)/r2, or at least it is implied you know how to derive that equation.

Judging from the picture, this is probably the sort of information the examiners wanted us to regurgitate, I think you're over-analysing it.
 

amrit92

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Im not that great at physics but heres wat i got:


  1. C
  2. A
  3. D (shit i think its C)
  4. D
  5. B (guessed, i had no idea!)
  6. A
  7. C (guessed, i struggle at these magnet ones..)
  8. C
  9. A
  10. B
  11. D (think so, sin and cos)
  12. C (guess C or D?)
  13. A (isnt this right??)
  14. C (weird i thuoght C and D both right?)
  15. A
Chem multiple choice is so much easier and less time consuming!
 

00iCon

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-the question does not give any information on the distances between the sun moon and earth

-the course does not provide information on the relative distance between the three in different cycles and phases

-the course specifies that gravity CANNOT be sheilded

therefore the answer to question 5 is (c)

(also the reasoning provided involving AU is wrong, AU is an average distance, and the distance between the earth and sun is definitly NOT constant)
I like this explanaiton, and i belive that that was the purpose of the question, because the distance of Earth to moon is incompapable with the sun - earth distance...
 

00iCon

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Im not that great at physics but heres wat i got:

  1. C
  2. A
  3. D (shit i think its C)
  4. D
  5. B (guessed, i had no idea!) Bad guess. currently being discussed.
  6. A
  7. C (guessed, i struggle at these magnet ones..)
  8. C
  9. A
  10. B
  11. D (think so, sin and cos) No, read posts before. also force doesn't start at zero.
  12. C (guess C or D?) Just checked Jacaranda textbook and it's (D)
  13. A (isnt this right??) Lattice vibrations are minimal. formation of Cooper pairs is the main reason for superconductivity
  14. C (weird i thuoght C and D both right?) INTENSITY is not related to threshold frequency.
  15. A
Chem multiple choice is so much easier and less time consuming!
check corrections above.
 

darkchild69

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Well, here is what i think:

1. C
2. A
3. C
4. D
5. C
6. A
7. C
8. C
9. A
10. B (So many of my guys put in (c) here!!!)
11. B
12. D
13. B
14. C
15. A


Opinions?
 
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untouchablecuz

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Well, here is what i think:

1. C
2. B
3. C
4. D
5. C
6. A
7. C
8. C
9. A
10. B (So many of my guys put in (c) here!!!)
11. B
12. D
13. B
14. C
15. A


Opinions?
according to this, i got 10/15, which im relatively content with

maybe im over analysing this, but:

13. i said A because the presence of these cooper pairs necessitates a lack of lattice vibrations. so essentially, it is the lack of lattice vibrations which result in the cooper pairs, thus resulting in superconductivity
 

AnandDNA

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Well, here is what i think:

1. C
2. B
3. C
4. D
5. C
6. A
7. C
8. C
9. A
10. B (So many of my guys put in (c) here!!!)
11. B
12. D
13. B
14. C
15. A


Opinions?

Um can u check q.2 again

i got A

a=v^2/r which was like 9.37 frm memory so 9.4-A

According to this i got 14/15 damn that force on AB question :(
 

00iCon

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maybe im over analysing this, but:

13. i said A because the presence of these cooper pairs necessitates a lack of lattice vibrations. so essentially, it is the lack of lattice vibrations which result in the cooper pairs, thus resulting in superconductivity
But what are phonons if they are not vibrations? where's you lack of vibrations now, bitch?
Um can u check q.2 again
i got A
a=v^2/r which was like 9.37 frm memory so 9.4-A
According to this i got 14/15 damn that force on AB question :(
Q2 should be A by calculation.
 

darkchild69

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Phonons are vibrational states.

BCS theory relies on phonons to describe how the cooper pairs occur.

Definately not A

Definately IS B


And sorry, yes 2 is (a), lol
 
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untouchablecuz

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Phonons are vibrational states.

BCS theory relies on phonons to describe how the cooper pairs occur.

Definately not A

Definately IS B


And sorry, yes 2 is (a), lol
ah ok

man, for 2 answers i had original chosen, i changed them to incorrect answers after looking back :(
 

tonyharrison

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The mc were stupid. like...a lot of them had 2 options that really could've been correct, depending on interpretation, wording etc.
 

darkchild69

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Yeah, i agree with the wording of some of the questions.

It's not an English test!

Either you know your stuff or you don't. Bugger trying to trick people with complicated and nonsensical wording.
 

tonyharrison

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For heaps of the questions i was like....wat is this asking? WHAT DO YOU WANT FROM ME?!?!
 

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