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6th Years and Leavers :: Chat Thread #2 :: Revenge of the Ape

Rain.

xo-Heva

Hallo.
I see yous didn't enjoy an extra hour in yer pit.

:awesome:

I did.

Reply 1662

TheUnbeliever

16

I still haven't received my ******* maintenance loan. Angry phonecall time (once I've cleared my feet of work).

Reply 1663

xo-Heva

14

I've lost a 20 quid note.
Ugh. Not happy... :mad:

Reply 1664

TheUnbeliever

16

ukdragon37

...

How did/would you start C12 in the maths examples sheet? I can solve it using a quite hideous method, but it's not really a vector approach.

Reply 1665

ukdragon37

14

TheUnbeliever

How did/would you start C12 in the maths examples sheet? I can solve it using a quite hideous method, but it's not really a vector approach.

What I did was separate out r by:

\bold{r}=\frac{1}{\lambda}\left(\bold{c}-\bold{a}\wedge\bold{r}\right)

Then substitute r on the right by the whole equation. Expand and then you'll need to do the substitution again. After some slightly tricky manipulation you should be able to get rid of r on the right hand side which means you'd have it on the left in closed form. If this was a normal equation you'd just go in circles but since it's a vector equation it works out.

The way which we were shown in the supervision (which is shorter than my method) is to wedge and dot the oiginal equation by a to create two new equations and then combine.

Reply 1666

TheUnbeliever

16

ukdragon37

What I did was separate out r by:

\bold{r}=\frac{1}{\lambda}\left(\bold{c}-\bold{a}\wedge\bold{r}\right)

I see, thanks very much. :smile:

The way which we were shown in the supervision (which is shorter than my method) is to wedge and dot the oiginal equation by a to create two new equations and then combine.

Ah, that's clever. I'd tried something halfway there (dotting by a) but didn't think it helped much. I'll give seeing this through a try, since it might be more interesting/general, but I'll try your method, too.

Reply 1667

ukdragon37

14

TheUnbeliever

Ah, that's clever. I'd tried something halfway there (dotting by a) but didn't think it helped much. I'll give seeing this through a try, since it might be more interesting/general, but I'll try your method, too.

Be careful when you do the second substitution. You'll have a choice between two r terms. It should be obvious which one to leave alone :wink:

If you do it right/the process I did you should do the r-substitution exactly twice.

Reply 1668

Madjackismad

13

All my vital organs are still connected. That's good.

Reply 1669

xo-Heva

14

Madjackismad

All my vital organs are still connected. That's good.

I found my 20 quid. That's good.

Reply 1670

Madjackismad

13

xo-Heva

I found my 20 quid. That's good.

Nice!

Reply 1671

ukdragon37

14

TheUnbeliever

....

Have you managed C12 yet? :p:

Reply 1672

bex285

20

Homework time :facepalm:

Reply 1673

xo-Heva

14

bex285

Homework time :facepalm:

Reply 1674

Kirsteneg

2

To anyone who is doing or has done A Streetcar Named Desire, what is the purpose of the cat screeching in the first scene? Just to create an uneasy atmosphere...or something else?

CBA! That's bad.

Kirsteneg

To anyone who is doing or has done A Streetcar Named Desire, what is the purpose of the cat screeching in the first scene? Just to create an uneasy atmosphere...or something else?

Could be symbolic of something. I've never done A Streetcar Named Desire anyway.

Reply 1677

ukdragon37

14

Kirsteneg

To anyone who is doing or has done A Streetcar Named Desire, what is the purpose of the cat screeching in the first scene? Just to create an uneasy atmosphere...or something else?