MAM2085 by Tracy Craig

You can double click here on the padlet wall and then type something. Or you can comment on what someone else said.

tracy_craig — 2017-03-15 11:27:51 UTC

What do you do if you get an I

2017-03-16 06:42:40 UTC

16/17

2017-03-17 06:59:36 UTC

Can we make r dependent on z instead of having z depend on r?

I'm confused as to how we can bound z & r for the cylindrical co-ords in 17 - the two appear to depend on each other.

Do we just make one inequality that has both z and r in it?

2017-03-17 09:02:20 UTC

Question 13C and 17

2017-03-19 20:48:49 UTC

I don't understand how you came up with the union. What exactly do they mean

Could you post the solution to page 85 &

2017-03-19 20:52:25 UTC

And the revision worksheet

2017-03-23 17:19:18 UTC

How would you convert from the parametric form x(t) = (x(t), y(t), z(t)) tER to the vector form x(t) = (1,2,3) + t(3,4,5) ?

Are the questions in the booklet typical tests and exams questions or are they only the basic version of a greater horror

2017-03-23 18:51:09 UTC

Tangents to Space Curves

2017-03-24 06:25:57 UTC

Why have you used <> around the direction vector instead of ()? Does it matter?

lecture videos

2017-03-24 10:05:19 UTC

where are the lecture vids?

Hi Tracy !

2017-03-24 20:12:12 UTC

In today's notes on tangent lines to curves you said that r'(a) is not normally orthogonal to r(a) unless r(t) is a constant magnitude. When would this not be the case? (that r(t) is not a constant magnitude?)
Thank You!

2017-03-24 20:19:56 UTC

When you have time would it be possible to please add the answers to numbers 11, 15 and 20 to the answer sheet pdf?

27c

2017-03-25 10:29:02 UTC

How would I go about finding the points of
intersection given that i have the parametric equations
for example
c1=(cos(t),-cos(t),2cos(t)
c2=(t,-t,t^2)
how would i go about solving for the points of intersection
?
Please help

q1

2017-03-27 17:59:35 UTC

when do you sub the given z value into the equation and when do you regarded as a plane. in this particular quesion you subed the zvalue but all this time we've been thinking of it as a plane

2017-03-28 19:54:31 UTC

what does it mean they say that "K(x) is continuous at x=3"?

Curvature of 2D curve

2017-03-28 19:58:21 UTC

Ma'am, I think there's meant to be a 'dash' on the f(x) in the denominator of the equation for working out 'k' for a 2D curve. So we should be plugging in the 1st derivative of f(x) (f'(x)) and not just f(x) into the denominator of the formula.

Question 29a

2017-03-28 20:53:11 UTC

Hi Tracy, I think you made a mistake in the solutions for 29a. It's supposed to be 4t=-6.

planar curves

2017-03-29 19:36:24 UTC

how do you show that a curve is a planar curve???

planar curves

2017-03-29 19:38:56 UTC

How can you tell that a curve is a planar curve by inspection.( if it is possible

visualizing and sketching curves

2017-03-29 19:56:24 UTC

what is the best site that sketches graphs. Whenever i search for one on google it requires me to download software...blah blah blah. please put a link

what is the venue for the Thursday tutorial group? at 14:00

2017-03-30 10:07:45 UTC

Using polar

2017-03-31 06:27:16 UTC

Can you use polar for point (1;2) and in your limit you define (x;y;r) tends to (1;2;root5)?

2017-04-03 17:40:31 UTC

when do we get our tut test marks back?
Does it go on our grade book?

For number 89

2017-04-04 09:46:48 UTC

We first did the lim from first principles and found out that they are different.
1.What can we conclude from the fact that they are different?
2. When we took the lim along x=0 and x=y we found out that they were different. So by them being different we can conclude that it is not continuous. So if they are the same would we conclude that it continuous?
3. We used the very same method to prove weather or not a limit exist, so if i prove that a limit exist,can i conclude that the function is continuous and vise versa

(a detailed explanation will be much appreciated tracy thank you)

2017-04-05 18:52:27 UTC

Ma'am for limits that don't exist, can we conclude that the limit doesn't exist after finding that along a certain path the limit is undefined

Is it okay to use L'hospital's rule for 69?

2017-04-05 19:41:11 UTC

tracy_craig — 2017-04-06 05:39:51 UTC

Implicit differentiation

2017-04-06 21:12:01 UTC

I was attempting q105c and I didn't understand it fully. What is meant by 'y is defined implicitly in terms of x'?

For test 1

2017-04-07 16:54:00 UTC

Til what chapter/section do we stop learning?

I found this break down method very useful

2017-04-08 14:44:28 UTC

https://www.youtube.com/watch?v=HOYA0-pOHsg
it helps with chain rule. Less formulae to cram!!!! ;-D

For test 1

2017-04-09 10:08:38 UTC

Must we know how to calculate binormal vector and unit Normal vector?
chapter 10.3 has questions on binormal and unit normal vectors, but our work book does not have any questions related to it.

For quest 100 d

2017-04-11 18:30:39 UTC

they ask if it is differentiable at (0,0)
so when using "elephant"
for f(0+h,0+k).... i would assume we are plugging in those valves for 2x+y because x and y is tending to 0..which means i would get 2h+k
However the memo shows that h and k is plugged into the second part of the function where z= x^2+y^2 ...getting an answer of h^2+k^2
My question is why would I plug my h and k in the second part of the function and not the first?

Hi Ms Craig

2017-04-12 16:10:13 UTC

You left your solutions book in the tut, I have it and will bring it to class tomorrow.
- Adie

2017-04-14 09:06:52 UTC

Ma'am, could you please upload solutions for 116-120

QU 88(a)

2017-04-15 15:29:54 UTC

How come dz/dx is y cos(xy) but d^2z/dx^2= -y^2 sin(y) and not -y^2 sin(xy)? Thanks in advance.

Hi Ms Craig

2017-04-15 19:30:47 UTC

In the 2016 test one past paper question 4 c) they ask us to compute the partial derivs of the piecewise fn f(x,y) = {x^2 + y^2 if y >= 0 and 4 if y < 0} at (2,0). For the y partial deriv why do we need to take the limits as k-->0+ and k-->0- as in the previous question we are asked if the fn is continuous at (2,0) and to prove this we prove that the limit at (2,0) exists and that it is equal to the fn value. So we already know that the limit at (2,0) exists, why do we need k to approach 0 from the pos and neg directions when computing the y partial deriv?
Thank you!

for question 119 a

2017-04-15 21:05:03 UTC

they ask for the directional derivative .......in the direction of (3,4).
Would my unit vector U= (1/root(10))(1,3)
I would have obtained that from subtracting (3,4)-(2.1) because they both are points
however the memo takes (3,4) has the unit vector. I am extremely confused.

if you look at question 110 they say the exact same thing but they get the unit vector by subtracting the 2 points. whereas in 119a they just take 3,4 as the unit vector

please help

2017-04-17 13:10:48 UTC

For question 100, why did they use the second equation for the y partial derivative ?

how we know if we have to interchange the order of integration, because trial n error chows time

2017-04-19 21:21:56 UTC

Class lists

2017-05-02 08:50:51 UTC

Hi ma'am. If you are still having trouble with all the different groups in the class and the differing lists, something like this might be helpful: http://www.webtoolhub.com/tn561406-list-comparison.aspx (it's a tool that looks for intersections and differences between lists).

When will test1 marks be out?

2017-05-02 13:33:22 UTC

Hi Ms Crai

mthmal025 — 2017-05-03 08:47:08 UTC

Could you please upload solutions for section 2.2 problem 26 -37

Flux

2017-05-05 14:14:19 UTC

Ma'am, are we done with the section on flux because I was attempting the questions after 34 and they were really complicated. They were nothing like the examples we tackled in class

47

2017-05-09 10:29:43 UTC

why has the symmetry changed from 47a to 47e. what is the difference with regards to the x intergration

Two stresses induced by UCT 1. The forever lingering possibility of exclusion. 2. The lack of care for well being in general. I write this standing in a queue for food as I have been for the last hour with as tut waiting for me as 2.

2017-05-10 10:52:50 UTC

For class test 1

2017-05-11 14:50:31 UTC

what was the highest mark
:)?

For question 35

2017-05-11 16:08:57 UTC

In the memo it has (double intergral) -2xz+x^2 da
The very next step it is
(double intergral) x^2 da

How did the -2xz disappear?
Please can you explain

The tut tests

2017-05-12 16:17:17 UTC

Hi tracy
now that the gradebook has been updated please could u upload the tut test questions and answers so that we may learn from our mistakes
thank you

70c

2017-05-15 15:37:02 UTC

if I chose (0,0,0) (1,1,1) and (2,2,2) as my points then I get a line as my image and the memo gives a plane.
how do you chose the correct points
thanks for apples mam

for 47 c

2017-05-17 19:24:46 UTC

can i simplyfy the answer further
the answer in the memo is
4(double integral)sqrt(4/4-x^2-y^2)

Can I say that since x^2+y^2=3
the sqrt(4/4-x^2-y^2)=sqrt(4/4-(x^2+y^2))=sqrt(4/4-3)=2

Therefore my final simplified answer= 8(double intergral) dA

Is there any specific reason why we use dA for double integrals and dV for triple integrals?

2017-05-19 21:27:08 UTC

Let f:R2 - R2 be defined by f(x,y) = (u(x,y) , v(x,y)) where u(x,y) = x^3 + y3 and v(x,y) =x^2 + 2y^

mbmlit001 — 2017-05-20 12:15:00 UTC

(c) Estimate the are of the image in u-v plane of a circle in the xy-plane with centre (-1,1) and radius 1/10?
How do you go about such questions,(with images and everything)

for quest 92

2017-05-21 10:10:30 UTC

for all co-ordinate changes a determinant has to be calculated
Why did i not calculate a determinant for quest 92

2017-05-21 19:58:56 UTC

is the gradebook still having issues? :(

for quest 105

2017-05-22 12:32:57 UTC

the memo has an intergral from 0 to pie/2. My assumption is that the intergral is from 0 to pie

Please can you explain to me why is it between 0 and pie/2

for Co-ordinate changes

2017-05-22 17:57:01 UTC

Whenever doing a co-ordinate change u always have to multiply by the determinant of the inverse i.e d(x,y)/d(u,v).....however why is this not true when changing to polar co-ordinates

for cl

2017-05-22 19:59:43 UTC

til what section do we stop studying

Question 88

2017-05-23 09:01:20 UTC

Ma'am for 88a. Shouldn't R' be on the uv plane not xy plane?

for quest 106 c

2017-05-23 10:07:27 UTC

the density is given as 1/sqrt(X^2+Y^2) . I assumed that sqrt(X^2+Y^2)=z
When doing the co-ordinate change i said 1/z = 1/pcos(phi) however the memo has 1/psin(phi)
i realized that 1/psin(phi) was obtained by subbing in x=pcos(teta)sin(phi) and y=psin(teta)sin(phi)

my quest is why is my answer incorrct...which is sqrt(X^2+Y^2)=z and z=pcos(phi)

for quest 117

2017-05-23 10:25:17 UTC

y is the intergral multiplied by 2

for quest 119

2017-05-23 11:08:48 UTC

they have sqrt(x^2+y^2) as the density and they some how get this to equal to r^2 and with the co ordinate change it is r^3

my answer for sqrt(x^2+y^2)=r

please can u help me

for quest 120

2017-05-24 15:23:05 UTC

the memo has the integral for pie/2 to pie/4 for r is 0 to sec(teta)
However I dont see how this is possible because when i draw my triangle I get 1/r = sin(teta), which means my r is cosec(teta)
Is the memo wrong am I wrong?

for quest 121

2017-05-24 17:23:49 UTC

They say calculate the mass of the parabolid. Why does the memo have a ds in the integral. They are not asking for surface area so why would we need to use ds for the calculation??

For quest 124

2017-05-24 20:02:25 UTC

why do i break down the integral of 0 to pi to 0 to pi/2 + pi/2 to pi
???

Chapter 2 solutions incomplete

2017-05-25 13:40:35 UTC

Hi Tracy , Could ma'am please upload the rest of the solutions for chapter 2? from 97 on wards

For quest 5(ii

2017-05-25 18:21:14 UTC

I understand that it is a circle in the first quad, and since it is in the first quad i would assume it goes from 0 to pi/2
However the memo has the intergral from 0 tp -pi/2
why is this so ?
by using 0 to pi/2 I get an answer of 8pi+16
but if i where to use 0 tp -pi/2 i get 8pi-16

For question 3 of Ch 3

2017-05-26 16:04:10 UTC

For the curve C1, the z part of the integral, you say that it is (-t)^2(-1)dt. But why is the -1 not the square root of (-1)^2 (which would make it +1)? Because I thought that the formula uses the modulus of r'(t) because it is the length

Chapter 3 Question2

2017-05-26 22:20:36 UTC

For the square root part of the integral, why does the memo say that the partial derivative under the square root is (4t^3)^2 and not ((4t^3)^2+(1)^2)

For class test 2

2017-05-27 08:50:33 UTC

Do we start studying from double intergrals or Directional derivatives?
because in class test 1 grad f was not included so do we need to know grad f as well or start learning from double intergrals
??

On flux notes

2017-05-27 12:20:46 UTC

Ma'am in your flux notes you said diversional therom will not be tested. Did we do diversion therom?

For quest 115

2017-05-29 14:13:37 UTC

Why is phi between 0 to pie/2
The region R is only in the first octant. Would that not restrict phi to 0 to pie/4

And for quest 115 c
Why would i change to cylinderical coordinates
I already have my intergral in spherical co ordinates in b when i calculated the mass, so the only thing different between b and c is that b has a density and C will not have a density
Please can you help me

question 109 chap 2

2017-05-29 17:26:57 UTC

what is the radius of the sphere?
we are given z =sqrt(x^2 + y^2 + z^2) what is this z?
thanks in advance

PAst papers

2017-05-31 21:38:19 UTC

Are there any more past papers for the class test

Chapter 2 Qn 119

2017-06-01 08:07:02 UTC

how do you integrate
cost(1-sin^2(t))?

Very confused! Question 117 Ch3

2017-06-02 16:20:03 UTC

Hi Tracy :) in the solution to 117, line number 6, it seems as though you have integrated sin^2(theta) to 1/3 sin^3(theta). Is it possible to maybe show how you got to that step? Because I thought that you need to use the identity sin^2(theta) = 1/2(1-cos(2theta))

For quest 34a

2017-06-02 20:43:54 UTC

how did
sin^4t+cos^4t=1-2cos^2sin^2

test

2017-06-03 07:40:56 UTC

apparently mainstream was told that grad (direction derivatives was in the test on mon, is this correct

for quest 6 CT2 2015

2017-06-03 11:04:31 UTC

Are we expected to know such flux questions because the memo shows that the answer was calculated using Divergence therom??

For 2013 CT2 quest 4

2017-06-03 13:29:07 UTC

Why is the mass of the sphere multiplied by 2

Flux

2017-06-03 17:47:36 UTC

What is the difference in approach when the fluid is moving in the upward direction as opposed to outward?

past papers

2017-06-03 20:46:07 UTC

Could you please upload the memo for 2013 end of semester exam please

June Exam 2016, question 5

2017-06-04 08:39:49 UTC

Why is the upper limit for theta pi/2 and not pi?

Deferred exam, Jan 2017

2017-06-04 12:05:40 UTC

Good day, may you please upload the memo for the above mentioned exam.

2015 CT2 Qn2

2017-06-04 12:21:09 UTC

i have a query on the limits of the double integral.
i don't get how the conversion factor was implemented in the question

Newtonian Method

2017-06-05 05:24:07 UTC

For question 44 a) in chapter 4, shouldn't the respective equations be x^2 + y^2 - 5 and 4x - y^2 instead of x^2 + y^2 - 6 and 3x - y^2 ,
as it is in the memo?

Dear tracy...

2017-06-07 16:12:12 UTC

We are now 3 lectures behind due to unforeseen circumstances,(the storm), The plan according to the work book is to finish the syllabus by the 15/06, some of us have already planned on how we are going to prepare for the exams, thus if maths lectures fall behind that puts alot of pressure on your dear 2085 student. :(

For quest 26

2017-06-08 21:53:22 UTC

From my knowledge , if a function is conservative and closed , work=0
When i looked at quest 26b i assumed the work =0 because t is between 0 and 2pie, and it is a closed surface, why is this not true, because the answer is a non zero value

Green's Thm where F(P,Q) is not defined at a certain point

2017-06-12 20:10:21 UTC

So far all the all the questions have P and Q that have the same denominator. I noticed that for Q40, 41 and 42 you chose the equation of the function/curve you to be equal to the denominator (of P & Q). is it wise to do that all the time. if not what is the trick to finding this equation.
Also, are P and Q always going to be fractions where dQ/dx == dP/dy such that when you apply Green's thm the answer is zero??
Thank you in advance

Exams

2017-06-13 16:07:25 UTC

Are we going to get a formula sheet in exams? Is it like the one found at the beginning of the handbook?

Divergence Tm (non-closed regions)

2017-06-14 14:44:01 UTC

when calculating the flux through the plate that you've added do we always assume that z=0?
The flux should always be outwards, right?

also, how (by just looking at the vector equation

For question 4b of taylors theorem

2017-06-14 14:45:01 UTC

Why do I just assume that the expansion up to the third degree is the function f(x,y)??

What is the explanation of it

For quest 7 - Local and absolute max

2017-06-14 16:55:21 UTC

We have conditions where fxx<0 and fxx>0 , what is the interpretation for fxx=0
??

For question 12c

2017-06-14 18:24:24 UTC

How would i be able to explain such an answer , there is no way that i would know the rate at which these 2 values are changing hence i would not know when it increases and when it decreases

Please help me

For quest 13 a

2017-06-14 18:32:05 UTC

How would i know how to draw such a curve. I tried using the let z= k method , however that got me nowhere,
Please can you explain to me how would i go about approaching this

For the exam

2017-06-14 22:16:20 UTC

Would we ever be given a function where its local and absolute max cannot be classified
because I have just done 18b and I have been trying so many functions to get a possible answer, however when i looked at the memo it showed more information is required

For 18c

2017-06-14 22:59:37 UTC

when i calculated D(x,y) where (x,y) are the stationary points (0,0) (3,0) (0,3)
when i calculated these, all D(x,y) were negative, which is why i assumed they where saddle points, however the memo does not state that......is my answer incorrect?

Tracy :)

2017-06-15 07:02:02 UTC

Thank you so so much for being one of the best maths teachers/lecturers I have ever had. I really enjoyed this course; all thanks to you. Thank you for really putting in extra effort for all of us and making 8am maths so enjoyable! We will all miss you next semester. Have a happy holiday and thank you for being the best!

ch 3, 34b, green's thrm

2017-06-15 08:14:20 UTC

why does the integrand become 3x^3 + 3y^3 ? and not just 3x^3

Maths lectures

2017-06-15 08:41:56 UTC

Tracy
Thank you for the great maths lectures. With that said, I really hope I don't see you in a classroom next semester :)

For class test 2

2017-06-16 21:47:02 UTC

What was the pass rate and highest mark?

Class Record

2017-06-17 13:53:30 UTC

Were there only 7 tut-tests?

Surface and regions

2017-06-19 17:16:31 UTC

In Q17, how did they get the values for z in the cylindrical coordinates?

Chapter 3 Qn 5(ii)

2017-06-20 08:28:49 UTC

considering the region in the 1st quadrant, should the limits not be from 0 to pi/2 instead of the -pi/2 to 0 used in the handbook solutions

Chp 4.2

2017-06-20 16:59:56 UTC

if i may ask about the conditions that we were given for a point to be a minima or maxima what if the d>0 and fxx is 0?

Chapter 3 Qn 17(i)

2017-06-21 08:10:57 UTC

Can you please explain how you parametrised C1? (the points on the line are (1,0) and (e,0) so i got r(t)=(1,0)+t tE[0,1] but your method seems simpler)

Wednesday 28th another storm?

tracy_craig — 2017-06-21 09:37:29 UTC

The weather website windguru (https://www.windguru.cz/91) which I find very accurate, is predicting another storm for next week Wednesday. If that prediction remains in place then I'll be available for online, not office, consultation. - Tracy

Section 2.2. Q. 32

2017-06-21 21:08:23 UTC

How do you get (x/2y)^0.5 + (y/2x)^0.5 from [1+ (x/2y) + (y/2x) ^0.5 ?

ch3 question 50

2017-06-24 19:26:01 UTC

Tracy would it be possible for you to please post a photo to the comments of how to parametrise the curve of intersection of the two surfaces as no matter what I do I cannot get the right answer

Ch3 Q 65.a

2017-06-25 12:46:33 UTC

am I correct in thinking that the volume density is given? p(x,y,z).
Because then how can we use the volume density in the mass equation for a surface integral? Why would we not have to use it in the mass equation for a triplle integral?

chapter 3 q65.c

2017-06-25 13:53:34 UTC

where does the pi disappear to in the second last line of the first flux calculation?

Chain rule

2017-06-25 20:55:18 UTC

we were never tested on chain rule
Do we need to learn it for the exam??

chapter 1 #44.

2017-06-26 16:56:32 UTC

how did the square root of 9(sint)^2cost)^4 + 9(sint)^4(cost)^2 go to 3(sint)^2(cost)^2

Green's Theorem

2017-06-27 21:19:21 UTC

Section 3.2, Question 30 in the handbook, when it is stated that the Unit circle is oriented positively does it mean it is only in the first quadrant? That was my first assumption but my calculations prove otherwise.

For quest 132

2017-06-28 12:22:41 UTC

the memo has k=-0.5
please can you explain how we got k=0.5
and in general how do i approach such a question cause i am not understanding the method behind it

Line intergrals

2017-06-28 13:26:21 UTC

Section 3.1, Question 5
number 5.a) i) Why are the limits of integration from -pi/2 to 0 and not from 0 to pi/2?

Is there going to be bonus marks in exam ?

2017-06-29 14:39:12 UTC

Normal plane

2017-06-29 15:30:06 UTC

Does it matter if you use the unit tangent vector as your normal vector when finding a normal plane, instead of using r'(t)?

part c question 21 chp 4

2017-06-29 21:04:41 UTC

how were the max and min values of t on each side of the triangle chosen?

chp 4.2 q20(C)

2017-06-30 07:49:31 UTC

in one of your solutions there is a sqrt(2) of which i dont really get how did you get it. please kindly explain that one for me.

Hi Tracy

2017-06-30 08:52:29 UTC

Could you please upload solutions to 2013 (semester 1) exam. many thanks :)

Chapter 1.3 Q74(e

2017-06-30 10:06:16 UTC

How can I identify when I am supposed to use polar coordinates?

stationery points

2017-06-30 13:54:04 UTC

why do we equate the partial derivatives to 0 when determining stationery points

for Local and absolute max/min

2017-06-30 23:08:44 UTC

when D=0
how do i choose my cross section strategically ??

please can you give me a detailed explanation

Question 104 part(b)

2017-07-01 12:42:12 UTC

In your solutions handbook, you use equations to reach the conclusion that p = 6sin(phi)sin(theta). However in your final answer, you state that p lies between 0 and 6 sin(phi) cos(theta)? Also, how do we find out that phi lies between 0 and pi/2?

2013 1st semester exam

2017-07-01 20:24:25 UTC

question 2 part c. can you please parametrise the curve C for me from S1 and S2

For question 7 June 2014

2017-07-02 12:45:37 UTC

the angle of phi is pie/3
However when i did my calculations i got pie/6

With regards to my calculations
i said my z=root(3)a and my r is a
so when i did my right angle triangle
_r_
z| /
|/ =phi

tan-1[r/z]=tan/1[root3]=pie/6
please can you explain where am i going wrong

June exam 2015, question 12

2017-07-02 17:09:04 UTC

I don't understand how the total flux is 72pi. Won't the total flux of the two discs cancel each other since their n's are (0,1,0) and (0,-1,0

2014 exam,question 6

2017-07-03 11:13:59 UTC

i thought we could only project on the yz and xz plane...

thank you

2017-07-03 13:33:43 UTC

Tracy, we appreciate all the work you did to help us get through this course. Thanks a million.

Ma'am

2017-07-03 18:21:17 UTC

Thanks for being the best math lecturer ever ❤️ We will miss you 😢 Continue being great 😊

June exam 2017

2017-07-23 16:11:15 UTC

When will we be getting our exam marks published?

BTW the June exam was alot more challenging than the past papers that i have done

tracy_craig — 2017-08-07 08:37:48 UTC

tracy_craig — 2017-08-07 08:39:56 UTC

tracy_craig — 2017-08-07 08:41:41 UTC

Web Assign

2017-08-22 14:30:00 UTC

Web Assign tool is not working on the Vula tab.

Video quality

tracy_craig — 2017-08-29 09:57:51 UTC

I was told the quality is rather patchy. I have adjusted some settings to make the recording higher quality. I hope it helps.

Web Assign

2017-09-27 08:34:10 UTC

Is it necessary to do the new assignments if you already done the previous ones and are satisfied with them. What if you only want to do one new assignment to replace the previous one?

webassign 3B

2017-09-28 12:00:22 UTC

Hi TRACY I'm having trouble with the first question on web assign

Test dates

2017-10-07 18:13:59 UTC

Hi Tracy, is our next Maths test on the 20th or the 30th of October

File giveaway

tracy_craig — 2017-10-09 10:15:05 UTC

I am throwing away old paperwork. I have some folders free to take: 2 ring binders and four lever arch files. Pop into my office and grab them if you want them. - tracy

Webassign Issues

2017-10-21 10:47:16 UTC

Webassign website is giving me issues. the cengage site says that the site is down.
What do I do?
I cannot complete my assignment 7

Thursday 26/10 tut

2017-10-26 11:53:11 UTC

Mvano and I are online to help you if you have any questions. You can click on the padlet wall and type text, or you can paste pictures. - Tracy

first semester class test 2

2017-10-27 21:47:20 UTC

Hi Tracy, can you perhaps upload the class test 2 of the first semester, 2017. I only see the solutions online.

Test 2

2017-10-28 17:55:47 UTC

Hi Tracy, some of our peers in Bob's class have received an email that Test 2 is pushed to the 6th of November. Can you confirm if this is true for our class as well?

How can I help you during suspension of face-to-face classes? - Tracy

2017-10-29 06:36:39 UTC

Options are to simply be in my office during office hours, or to be in a coffee shop somewhere (Wimpy?) where you could come and sit and work. If the latter, don't worry about cost; I'd buy some limited snacks and coffee etc. to stop them throwing us out. Let me know your thoughts. - Tracy

"Lecture video" link in Vula

tracy_craig — 2017-10-30 10:24:55 UTC

The Lecture Video thing you'll see listed on our Vula site is supposed to allow for me to upload videos at a variety of resolutions. So far it has only allowed me to upload one video, it is refusing the second one. And I cannot see how a variety of resolutions is catered for. does it ask you when you download? #puzzled

Tuesday 31 October

tracy_craig — 2017-10-31 05:57:31 UTC

I shall be in my office all day. Feel free to pop in or to email/use padlet. If you and some friends want to come and work in the ASPECT office or in a nearby venue, that might be quite productive. The course is continuing even though face-to-face classes are suspended. - tracy

Line Integrals

2017-11-01 15:34:50 UTC

Hi Tracy. I'm struggling to understand how to get the limit values of the line integrals for questions 7b and 8a in chapter 3. If you could please clarify how they got these values it would be much appreciated!

Calculator in test 2?

2017-11-01 19:11:35 UTC

Are we allowed calculators for test two?
And also please confirm for the exam.

2014 second semester class test 2 memo

2017-11-01 21:12:51 UTC

Hi Tracy,

can you please upload the memo for the 2014 CT2, second semester.

thank you

Thursday 2 November

tracy_craig — 2017-11-02 08:13:28 UTC

The lecture went off okay, although I know many of you were affected by the shuttles not running. I went to the 3rd period tut but the venue was locked and no one seemed to be there. I left after 5 minutes. The afternoon tut will not take place in person, but Mvano will be available online. - tracy

Green's Theorem

2017-11-03 15:29:09 UTC

Good Afternoon Tracy

For Chapter 3, question 29e (looking at diagram e1) the memo uses polar coordinates to solve the integral, however I didn't use polar coordinates and got a different answer. So, why did they use polar coordinates? (the integral is really simple after using Green's Theorem). And should my answer be the same as the memos even if I just integrated normally? (maybe I made a mistake?). And if you have to use polar coordinates, how would I know (I thought you only use polar coordinates if the integral will be easier to solve that way).

2017-11-04 12:41:30 UTC

Cylindrical co-ords

2017-11-04 23:00:55 UTC

Chapter 2 Question 97
How did the last integral evaluate to pi/3? I am struggling to find how it came about.

Drawing surfaces

2017-11-12 15:56:46 UTC

i am really struggling to draw the surfaces for double and triple integrals, is there programme i can use to check my sketches as not all answers in the handbook have drawings

Chapter 2

2017-11-14 20:57:40 UTC

2015 june exam

2017-11-16 15:03:50 UTC

Hi Tracy can you please explain how to do question 11 of the 2015 june exam.

thank you

Past exam memos

2017-11-17 07:15:42 UTC

would it be possible to upload the memos for 2014, 2015, 2016 second semester exams and the 2017 first semester exam?

Could you please possibly post a pic of the surface for question 97a in chapter 2 of the handbook

2017-11-21 11:22:32 UTC

Im really sad. The exam was neither fun nor friendly. :(

2017-11-28 12:56:07 UTC