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so true what happened to the good old days when pracs gave you testicular cancer and mercury send you mad? I say more blowing up stuff, less english. can i get a "here here"

for q b i didnt do that colour index thing, i used the M=m - 5log(d/10) equation to work out the distance with the red filter, then i used the same formula for the blue filter and distance to work out the absolute blue magnitude. I got rigel

what did you guys get for d)ii) though. I was stumped coz it sais the seperation between the two, does that mean you times the radius to center of mass by two?

For d)iii) i did this Let I= k(pi)r^2 Now 100= k(pi)r^2 (1) and 99= k(pi)( r^2-R^2) where r is radius of big and R is radius of small, as this is the apparent surface area. so 99= k(pi)r^2 - k(pi)R^2 99= 100 - k(pi)R^2 from above 1= k(pi)R^2...

the electron can act as a wave and a particle. I did the same Q and i didnt think it was hertz either, hertz and nothing to do with catchode rays, did he?

thats awsome, how long r u staying for

thanks thats top stuff, textbooks are crap. ah thats why when the supply EMF = the back emf the motor stops accelerating and reaches an equilibrium got it

In 1957, a team of three scientists, John Bardeen, Leon Cooper and Robert Schrieffer proposed the first plausible explanation of superconductivity. They proposed that at very low temperatures the carriers of electricity are not single electrons, but pairs of electrons called Cooper pairs. Whilst...

What is the go with back EMF. You see questions like a resistor is put in series with an electric motor to stop it from burning out? This is the only topic im fuzzy on and i got no idea. Anyone out there with some answers.

e) make them run until they approach the speed of light so that they get realy heavy and slow and small, turning into infinate amounts of energy so that he could run his car off them. f) burn them to make "black bodies"........

our prac was spinning a bar magnet ( stuck to a drill) below a suspended aluminium disc. Eddy currents where produced in the disc setting up a magnetinc feild to appose the motion of the spinning magnet, this magnetic field in turn (excuse the pun) follows the external magnetic field, spinning.

so what do you think xyma is the net force zero or equal to the gravitational force

there is a force towards the earth ( gravitational attraction), but..... hmm youve got me there, i dont think the net force is zero as a net force of zero means staying still, and no longer accelerating (like sitting in a chair), a satellite however is always being acted on by the gravitational...

although there was no direct debate between Einstien and Plank on this issu, it seems that Plank and Einstien took different veiws about science and politics. During the nazi era in germany, plank stayed on and directed the kaiser Wilhelm institute, while Einstien and others left (otherwise...

yeah our teacher didnt teach us barely any of the option for physics, now the test is tomorrow and i still havent done any. I should probrably not be writing this and go and study.

i did that once, it hurt, i had to go see a doctor.

If stuck in the exam, just write your area of study essay and include the occasional number/old guys name/year/picture of coils. As physics has become english anyway.

Can someone, in 25 words or less, explain the entire course to me?

y arent my posts going up

im going to restore/ build the decapitating sail boat that my grandfather made in 1960 after hsc. Its 12m and is rotting, prolly have to strip most of it. But parents are giving me dosh to do it so im stoked. Its a bit job though, hasnt been out on the water in twenty years, since my pop died.