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September 18, 2025, 03:43:00 pm
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Author Topic: Exam 2 2015  (Read 6773 times)

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jazzycab

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Exam 2 2015
« on: November 09, 2015, 06:53:23 pm »
Here are my answer's to this year's exam 2:
http://www.mediafire.com/view/vriwxga7bkcxcm5/Exam_2_Solutions.pdf
There may be some errors as I did this quite quickly.
I know my Direction Field goes through the incorrect points, but I've redrawn it and still believe I have the correct answer for that one.
Wow, they really hammered Argand Diagrams and "which of these is correct/incorrect" this year!
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Splash-Tackle-Flail

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Re: Exam 2 2015
« Reply #1 on: November 09, 2015, 06:57:50 pm »
Are you sure about Q9? of the multiple choice?
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jazzycab

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Re: Exam 2 2015
« Reply #2 on: November 09, 2015, 07:02:27 pm »
Yeah, fairly certain about Q9, spent more time on that than any other question. The relevant working is boxed (using the cos double angle formula)
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Orb

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Re: Exam 2 2015
« Reply #3 on: November 09, 2015, 07:10:46 pm »
Er 3e I think you've doubled the area?

Also 4aii) I think the angle is 47 degrees?
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cosine

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Re: Exam 2 2015
« Reply #4 on: November 09, 2015, 07:11:36 pm »
Q9 I got C because the magnitude of z2 is smaller than 1, as confirmed by A. So r1/r2 would be like 1/0.5 = 2 which is more than r1?

Also guys how many marks would they take off for rounding errors? I have done it more than once, and hence the next question which also has a decimal would be ever so slightly off, like by 0.01, would they only take 1 mark per question or exam?
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t101

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Re: Exam 2 2015
« Reply #5 on: November 09, 2015, 07:37:05 pm »
what were your thoughts as a whole? I thought it was a pretty tough exam.
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Splash-Tackle-Flail

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Re: Exam 2 2015
« Reply #6 on: November 09, 2015, 07:46:01 pm »
Quote from: cosine on November 09, 2015, 07:11:36 pm
Q9 I got C because the magnitude of z2 is smaller than 1, as confirmed by A. So r1/r2 would be like 1/0.5 = 2 which is more than r1?

Also guys how many marks would they take off for rounding errors? I have done it more than once, and hence the next question which also has a decimal would be ever so slightly off, like by 0.01, would they only take 1 mark per question or exam?

Yeah I got C too, I think the inequality sign was switched around on the solutions' working
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kiko98

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Re: Exam 2 2015
« Reply #7 on: November 09, 2015, 08:27:23 pm »
Can anyone verify the answers to Q13 and Q16?
For Q13 i got C....
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GeniDoi

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Re: Exam 2 2015
« Reply #8 on: November 09, 2015, 08:43:42 pm »
Quote from: kiko98 on November 09, 2015, 08:27:23 pm
Can anyone verify the answers to Q13 and Q16?
For Q13 i got C....

I have a gut feeling this question will have a lot of controversy surrounding it for years to come.
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zsteve

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Re: Exam 2 2015
« Reply #9 on: November 09, 2015, 08:46:36 pm »
Quote from: cosine on November 09, 2015, 07:11:36 pm
Q9 I got C because the magnitude of z2 is smaller than 1, as confirmed by A. So r1/r2 would be like 1/0.5 = 2 which is more than r1?

Also guys how many marks would they take off for rounding errors? I have done it more than once, and hence the next question which also has a decimal would be ever so slightly off, like by 0.01, would they only take 1 mark per question or exam?

Yup 9 was C, it's a result of r2<1 which is obviously true (r1r2 < r1)
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lomonm10

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Re: Exam 2 2015
« Reply #10 on: November 09, 2015, 08:48:27 pm »
Quote from: kiko98 on November 09, 2015, 08:27:23 pm
Can anyone verify the answers to Q13 and Q16?
For Q13 i got C....

I got D for 16
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TiffanyF01

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Re: Exam 2 2015
« Reply #11 on: November 09, 2015, 08:49:28 pm »
Yeah I got 9C, 13D and 16D too
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grannysmith

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Re: Exam 2 2015
« Reply #12 on: November 09, 2015, 08:56:20 pm »
Unfortunately I don't think it's D for 16....

Also what did people get for 4 ii (the angle)?
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GeniDoi

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Re: Exam 2 2015
« Reply #13 on: November 09, 2015, 08:57:16 pm »
Quote from: grannysmith on November 09, 2015, 08:56:20 pm
Unfortunately I don't think it's D for 16....

Also what did people get for 4 ii (the angle)?

16 is A. The tensions are vectors, not magnitudes, so by the definition of an equilibrium, the sum of the forces will equal 0, so A.
« Last Edit: November 09, 2015, 09:14:22 pm by GeniDoi »
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lena36

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Re: Exam 2 2015
« Reply #14 on: November 09, 2015, 09:06:46 pm »
Quote from: grannysmith on November 09, 2015, 08:56:20 pm
Unfortunately I don't think it's D for 16....

Also what did people get for 4 ii (the angle)?

i got 47degrees :/
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