Want to compare multiple-choice answers? (2 Viewers)

[dunno04]

can anyone mark it...instead of listing it out.
I wanna kno whether it is right or wrong....

=D

 

[XcarvengerX]

Haha BOS has done it again...

Question 7:
If you got B, that's mean you used 0.4m as length and sin45 which is incorrect. (but this is what I got )
If you got C, well, there are two choices here:
1 if you used sin45 BUT use diagonal length (pythagoras stuff)
2 if you used sin90 BUT use 0.4m as length
If you got D, you used sin90 AND diagonal length (pythagoras stuff)

Very interesting question...

 

[angmor]

where did u get this info from? and does this mean A is the right answer?

 

[RingerINC]

D is right.

 

[XcarvengerX]

where did u get this info from? and does this mean A is the right answer?

A is the most incorrect one. Where I found this? Calculate it yourself, take like 10 seconds. That's why there is a lot of misunderstanding when replying to people who had picked C.

Don't know if it is C or D though, but I think it is C because the orientation of the coil does not matter as long as it is perpendicular to the magnetic field lines. (Oh wait, I think it does, so it must be D then because there are higher probability people will choose C due to 2 different circumstances I have described above. Therefore, BOS being so evil, wanted perfection from us. So yeah, I now think question 7 is D).

 

[XcarvengerX]

these are mine

--------------------------------------------------------------------------------

1.B
2.A
3.C
4.C
5.B
6.B
7.D
8.B
9.A
10.C
11.B
12.A
13.D
14.A
15.C

im aiming for 99 in physics

No, you are not serious. You got everything wrong I believe (except 7 and 13)

This is the most correct answer at the moment (the only ambiguous one is 9):
1. C
2. B
3. D
4. B
5. D
6. A
7. D
8. A
9. B
10. A
11. A
12. C
13. D
14. C
15. A

 

[angmor]

i used pythagoras and i used sin 90....i still got A for the answer...

 

[angmor]

for question 3, the accleration time graph - wouldnt acceleartion be a constant?

 

[XcarvengerX]

i used pythagoras and i used sin 90....i still got A for the answer...

Tell me how can you get A?

for question 3, the accleration time graph - wouldnt acceleartion be a constant?

Question 3 is aether thing. You referred to question 4 which is yes.

 

[andyman20]

Q10 Is Effed....

My answers are:

C
B
D
B
D
A
D
A
B
B <---------- WTF???!?!?!?!!!?
A
C
D
C
A


WHOS SHURE OF QUESTION 10?????

 

[XcarvengerX]

Re: Q10 Is Effed....

My answers are:

C
B
D
B
D
A
D
A
B
B <---------- WTF???!?!?!?!!!?
A
C
D
C
A


WHOS SHURE OF QUESTION 10?????

10. A (Look at few post above for some discussion about this)

You got 14/15 if 9 is B which I gradually believe to be true.

 

[suchet_i]

i got 15/15 if i got Q9 rite .. i put down C ... and reading back again and again and even after looking at explanations here i still think its C

 

[XcarvengerX]

i got 15/15 if i got Q9 rite .. i put down C ... and reading back again and again and even after looking at explanations here i still think its C

Are you sure you are not confusing current with conventional current? I assume throughout the physics course we take it as conventional current whenever "current" word appears, otherwise it will be called electron.

 

[maCe]

I put C for Question 9. It's definitely not A - it's a homopolar generator. It's not D either, it can't be AC as there's no change in the polarity - as the metal disc is always rotating in the same direction, relative to the static components (brushes/magnets/indicator). So that leaves B or C.

There's a picture on Page 5 of this thread with a diagram of a homopolar generator, and the accompanying post saying that it indicates the answer is B - might I point out, the orientation of the magnets in that picture is the opposite to whats in the exam paper.

Nah pretty sure it's B

Also, Homopolar motors operate on a similar principle, as in, they don't need a commutator or slip rings etc, and yet operate on DC power. It's easy to make one too, and fun to mess around with

See: http://en.wikipedia.org/wiki/Homopolar_motor

My answers:
1 C
2 B
3 D [Typo before]
4 B
5 D
6 A
7 B [wrong]
8 C [questionable - negative magnetic flux??]
9 C [as above]
10 B [no idea, probably wrong]
11 A
12 C
13 D
14 C
15 A

 

[StYlez-]

1. C
2. B
3. D
4. B
5. D
6. A
7. C (use pythagoras, sin 45)
8. A
9.B
10. B ( i got wrong, its D)
11. A
12. C
13. D
14.C
15.A

im pretty sure i got 14/15. mehz.

 

[nath_quam]

Can someone tell me what i got plz i think 13/15 5&7 wrong
1. C
2. B
3. D
4. B
5. C
6. A
7. C
8. A
9. B
10. A
11. A
12. C
13. D
14. C
15. A

i got 5/15 on my trial so hopefully better this time

 

[XcarvengerX]

@StYlez - 13/15, if 9 is B.
7 is D (look at it again, it is sin90, the 45 is just to trick you)
10 is A (It is DC)

@nath_quam - 13/15 if 9 is B.
5 is D (using Kepler's Third Law. How did you get C?)
7 is D (look at the diagram again, it is sin90, the 45 is just to trick you OR you probably used sin90 but the length should be the diagonal length of the square magnetic field)

 

[nath_quam]

Thanks don't ask how i got C for 5, stupid mistake

 

[StYlez-]

meh 13/15 is still aiight.

got 6/15 in trial LOl

 

[matty fwd]

Please mark these for us!
1. C
2. B
3. D
4. B
5. D
6. A
7. B
8. B
9. B
10. C - wat was i thinking?
11. A
12. C
13. D
14. C
15. A

12/15 from XcarvengerX earlier post....which ones are you still unsure of?