phys (0129) - Space: gravitation

first lesson in new physics class. apparently they're ahead of ours, but i'm not quite sure if that's accurate. if they are, it doesn't seem like much of a gap, nonetheless i'm gonna have to look it up.

so we combined and discussed two formulas today..

F = (mv^2)/r [centripetal force]

and

F = G (m1m2)/d^2 [gravity between two masses]

to understand motion of satellites.

just to keep in mind, G = 6.67x10^-11, radius of earth is approx 6400km again in case i forget, and earth's mass is equal to 6x10^24kg

Physics Study.

Due to boredom, i might as well keep this blog going in the holidays.

Today i summarised Orbital Velocity, Re-Entry Factors, and changes in Launch acceleration.

Still have to do research on Scientist (Von Braun ?)

Hooray for making today productive.

Note to self.

MUST STUDY IN HOLIDAYS

ag (1210) - Lettuce: nitrogen fixation

legumes fix nitrogen, well at least.. the rhizobium bacteria that attaches themselves to the roots does.

its a mutual relationship, the plan tgets nitrogen and the bacteria gets sugars and whatever from the plant, also an environment to live in.

legumes include plants like clover, medic (eg lucerne) and peas

bio (1210) - MaB: [p] analysing xylem

check prac report to double check, celery was left to absorn coloured water for af ew adys, and today was cut up, transverse and longitudal (thinly) and looked at under a microscope.

what was seen was drawn. observed uncoloured phloem adjacent xylem and lignin wrapped around xylem in the longitudal thingo

math (1209) - Locus: parabolas

apparently, if you make a point (focus, let it = S) within a parabola, and the distance between that point (let it = a) is the distance between the parabola and a line (x = + or - a as the equation depending) then.. the distance from that focus point, to a point on the parabola (P) is equal to the distance from that point, down to the point on the x = a line that shares the same x-coordinate as P, and that would be B.

confusing?

diagrams help.

basically.

PS = PB

use distance formula, get rid of square root

we get:

(x - 0)^2 + (y - a)^2 = (x - x)^2 + (y - -a)^2

x^2 + y^2 - 2ay + a^2 = y^2 +2ay + a^2

cancel out the crap..

x^2 = 4ay

just saying, this was a parabola with vertex at the origin.

to change this, just sub in the different coordinates into the distance formula.

likewise..

if the formula was eg

-x^2 = 4ay

it would be concave down, coz rearranging to make y the subject would make the x^2 negative

ext2 (1208) - day 7: workshop 1

apparently the first workshop of two.

it was acutally good.

we got a lowdown on plagiarising and how things are marked. we're not compared to other people, we're compared to the marking criteria, despite having many or no other people diong our area of work.

interesting exercise today.. 10min of non-stop writing.

i dunno if it was meant to be creative or reflective, i ended up doing 2 scripts.

apparently they turned out pretty well. and like.. i wrote a page and a half approx in 10min, like a bit less. so i SHOULD be able to write 6 pages in 40min just like ms sproule said about ext1 people. i guess that's what happens when you write without thinking.

dont think.. thats one of the rules about creative writing, even essay writing.

any ideas.. just get it down.

well with creative writing, dont hold back.. let it all out, lose control, dont stop once your hand starts moving. there are other rules, check book for details.

met other people too, interesting to meet someone doing radio drama, the only one there, and i was the only one doing film.

i'm curious to see their story/ies though.

my journal was checked, im on the right track so far, and i handed in my statement of intention of my story, the one about two people and their parents getting married. in the end i decided the concept to be how differently people see things differnetly.

anyway.. its late.. im sleepy.. late post..

should hit the hay.

cant rmeember other stuff