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C4 January 2013 28/01/2013

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Reply 80

ezioaudi77

Original post by L'Evil Fish

I've come across it :tongue:

Big talk coming from a man who cannot integrate lnx :tongue:

Reply 81

L'Evil Fish

Original post by ezioaudi77

Big talk coming from a man who cannot integrate lnx :tongue:

I can!!!

Reply 82

ezioaudi77

Original post by L'Evil Fish

I can!!!

Then what did you mean by this? :curious:

Original post by L'Evil Fish

Pi * integral of (lny)^2

Obviously that one won't happen but

Reply 83

L'Evil Fish

Original post by ezioaudi77

Then what did you mean by this? :curious:

Yeah I thought it wouldn't because it's under the x axis :tongue:

Reply 84

ezioaudi77

Original post by L'Evil Fish

Yeah I thought it wouldn't because it's under the x axis :tongue:

Because of that, I had to type the whole integration of 2lny :colonhash:

Oh well.

Reply 85

L'Evil Fish

Original post by ezioaudi77

Because of that, I had to type the whole integration of 2lny :colonhash:

Oh well.

oops

Reply 86

dan94adibi

Original post by ezioaudi77

Usually it is given as y=f(x), and to find the volume of revolution,

\pi \int [f(x)]^2 dx

To find revolution around y-axis, make x the subject, hence x=f(y). Then

\pi \int [f(y)]^2 dy

The limits on your integral? the a and b become the coordinates on the y axis?

(edited 11 years ago)

Reply 87

ezioaudi77

Original post by dan94adibi

The limits on your integral? the a and b become the coordinates on the y axis?

Yeah, you have to change the limits according to the variable you are integrating with respect to, unless the limits are specifically mentioned in the question.

Reply 88

bexlovescandy

Original post by ezioaudi77

How many UMS do you need in C4 for the A*? 94 for me :s-smilie:

92 for me...but I don't think it is happening haha. Focussing more on trying to get an A in further haha. :smile:

I make too many mindless errors...

Reply 89

101101

I need 80 in C4 for the *

Reply 90

dan94adibi

I haven't done C3 yet but I think I'll get around 95 - 100 then that will leave me needing 85 - 80 and S2 perhaps a C. I'm just nervous about this exam. Really want a good grade in it.

Reply 91

ezioaudi77

Original post by bexlovescandy

92 for me...but I don't think it is happening haha. Focussing more on trying to get an A in further haha. :smile:

I make too many mindless errors...

Hmm, I think I saw some FP units fall on the same day as C4...if so, :crossedf:

.

I made a lot of errors too, practised a lot of papers since then, but there is ALWAYS something :mad:

Hopefully, no such mindless errors in the real deal.

Reply 92

ezioaudi77

Original post by 101101

I need 80 in C4 for the *

If you have the capacity to get 100 UMS for C3, obviously 80 wouldn't be a big deal for you :lol:

Reply 93

ezioaudi77

Original post by dan94adibi

I haven't done C3 yet but I think I'll get around 95 - 100 then that will leave me needing 85 - 80 and S2 perhaps a C. I'm just nervous about this exam. Really want a good grade in it.

We can only hope that no freakishly difficult questions come up, and grade boundaries be low as ever!

Reply 94

dan94adibi

Original post by ezioaudi77

We can only hope that no freakishly difficult questions come up, and grade boundaries be low as ever!

I think since the introduction of A* the papers have been much more easier. Hopefully they'll continue with the trend.
The main areas that has been a struggle for me before the 2010 papers was vectors differential equations but now it just seems to be differential equations.

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Reply 95

101101

Original post by ezioaudi77

If you have the capacity to get 100 UMS for C3, obviously 80 wouldn't be a big deal for you :lol:

You would think that but last time i got 79 in C4 :L

Reply 96

JenniS

Original post by ezioaudi77

If you have the capacity to get 100 UMS for C3, obviously 80 wouldn't be a big deal for you :lol:

this probably sounds really stupid but do you not have to necessarily get above 90ums in C4 and C3 separately but just average 90ums between the two?

Reply 97

kettlechips

Original post by JenniS

this probably sounds really stupid but do you not have to necessarily get above 90ums in C4 and C3 separately but just average 90ums between the two?

yep, you need a combined ums of 180 or more. For example, in the summer I got 85 in C4 but 98 in C3 so i still got a A* as my total was 183

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Reply 98

JenniS

Original post by kettlechips

yep, you need a combined ums of 180 or more. For example, in the summer I got 85 in C4 but 98 in C3 so i still got a A* as my total was 183

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oh thats slightly more encouraging then, thanks, our teachers have neglected to mention this!

Reply 99

ezioaudi77

Original post by dan94adibi

I think since the introduction of A* the papers have been much more easier. Hopefully they'll continue with the trend.

Yeah, but I have a feeling that since this is going to be the last January exam, they might give a really tough paper :frown:

Original post by dan94adibi

The main areas that has been a struggle for me before the 2010 papers was vectors differential equations but now it just seems to be differential equations.

I hated differential questions where you have to finds rates of change with chain rule, etc... After focusing on such question in Solomon papers, now I LOVE them! :biggrin: