a man named orsted figured that moving a current next to a compass had an effect on it.
another dude called faraday took this idea that magnetism and electricity were related and experimented with it. he moved a magnet towards and near a coil and realized that it produced a current (shown by a galvanometer)
thing is, current is only induced if there's a change of flux (that is, magnetic field strength) so using a simple DC power supply would not be the same as AC. alternatively, stationary magnets wont do anything, it has to be like, moving.
a generator looks like a motor but is basiclaly the opposite.
i'm realy tired and lazy so i'll edit this later.
Thursday, April 22, 2010
math (0422) - GeoDer: point of inflection
the point of inflection has a tangent with gradient = 0, ie. is a stationary point.
it occurs for x^3 graphs, where on both sides of the stationary point, y increases or decreases depending on the formula.
to test for this, we draw up a table and test for the number that results in f'(x) = 0, and then for a number higher than the x value that resulted in that, and lower than that.
the result will give us the shape of the graph
it occurs for x^3 graphs, where on both sides of the stationary point, y increases or decreases depending on the formula.
to test for this, we draw up a table and test for the number that results in f'(x) = 0, and then for a number higher than the x value that resulted in that, and lower than that.
the result will give us the shape of the graph
bio (0422) - BoL: DNA revision
well we finished the experiment today too, we wrote down results. essentially the plants that were watered grew many, large leaves, as opposed to pretty much none on the unwatered plants. also the ones that got more sunlight had bigger leaves.
after that we just did a bit of revision on DNA.
deoxyribonucleic acid, is composed of nucleotides. a nucleotide is composed of a sugar (deoxyribose) a nitrogen base (adenine, thymine, cytosine and guanine) and a phosphate that bonds the sugar to another sugar.
RNA is pretty much the same, but unlike DNA that is a double helix, RNA is a single strand, and it has uracil instead of thymine.
random note: humans have been around for like a million years, and cyanobacteria like dominiated for liek 2 billion years, dinosaurs for like 400 million.
mitosis produces 2 daughter cells taht are identical, and have a set of chromosomes each (46 for people) these are somatic cells.
the opposite of somatic cells are gametic cells, or gametes (sex cells) they only possess half the amount of chromosomes each (23) and they combine to create the offspring's genes and stuff. this is what causes variation, and hence, evolution.
after that we just did a bit of revision on DNA.
deoxyribonucleic acid, is composed of nucleotides. a nucleotide is composed of a sugar (deoxyribose) a nitrogen base (adenine, thymine, cytosine and guanine) and a phosphate that bonds the sugar to another sugar.
RNA is pretty much the same, but unlike DNA that is a double helix, RNA is a single strand, and it has uracil instead of thymine.
random note: humans have been around for like a million years, and cyanobacteria like dominiated for liek 2 billion years, dinosaurs for like 400 million.
mitosis produces 2 daughter cells taht are identical, and have a set of chromosomes each (46 for people) these are somatic cells.
the opposite of somatic cells are gametic cells, or gametes (sex cells) they only possess half the amount of chromosomes each (23) and they combine to create the offspring's genes and stuff. this is what causes variation, and hence, evolution.
Wednesday, April 21, 2010
math (0421) - GeoDer: increase/decrease
this is essentially a continuation of yesterday's post.
just a few things to add.
maximum point is generally the staionary point or turning point tht is of highest y value. called "local maximum" if the graph is ongoing (ie. with arrows) but if it terminates then it's the absolute maximum.
same goes for minimum, which is the lowest.
interesting thing is that if one differentiates a straight line, the resulting graph would be a straight horizontal line, and it's y value would be equal to the gradient of the line, which was differentiated.
just a few things to add.
maximum point is generally the staionary point or turning point tht is of highest y value. called "local maximum" if the graph is ongoing (ie. with arrows) but if it terminates then it's the absolute maximum.
same goes for minimum, which is the lowest.
interesting thing is that if one differentiates a straight line, the resulting graph would be a straight horizontal line, and it's y value would be equal to the gradient of the line, which was differentiated.
Tuesday, April 20, 2010
ext2 (0420) - day 15: film
i haven't written or posted anything all holidays, even though i considered it, even thought of what i was going to write, but in the end other things got in the way. so ultimately this week's reflection is about the holidays as well as today's lesson, which are linked anyway.
a real bother was taht i couldn't get my hands on the priest in charge of the church where i wnted to film some of my scenes. i went on the first thursday of the holidays and found out he'd be gone for the week, and he wasn't there either on the following thursday either (the day before filming) but i did manage to get on the phone with him on friday night (after filming) and got the ok.
in the meantime.. is houldn't have left it so late to work on the script, i should've at least allowed my actors to learn it rather than showing them on the day. one also could not make it so i had to bring in a sub from ext2 class, i knew this was gonna be the first take anyway, and we would re-do it all anyway, this was all just for test.
in the end i didn't script the whole thing, since we wouldn't be in the chruch anyway, so i made an alternative script (not as long though) and it was tough not being able to write dialogue between teenage girls. so i asked around for some help, and got some, in fact i got quite a bit of other insight also.
this holidays was also useful for watching and reading other texts taht helped me, mind you.
anyway, on the day of filming, my tripod was misplaced so i went ahead with handheld, but my actors arrived late, half an hour and about an hour respectively. but ultimately, we got all the shots done from the script down, but next time it'd be a good idea that they see the script prior to the day. much prior to the day.
i edited the film on the weekend before school commenced, but i didn't get it finished due to other assignments. but so far, things are looking well.
noone has given any negative feedback, at least none of the people i shwoed yesterday (including the teacher) i was afraid it would be too cliche or too angst, or both. but that's also what i'm afraid of. noone is being particularly critical of it, but i suppose we should wait for my day to be analyzed by everyone. but perhaps it's good because it just seems like a regular movie.. i dunno.
the teacher gave quite a bit of advice. for one, i should make a script then find location to suit it, instead of finding location then scripting based on that. secondly, the teacher has a boom mike if i need it, if wind is a problem, or echos.
i did have this idea about deaf and blind people though.. but i've already begun with this. perhaps i should ask around before i get too deep into this. but time is running out. only 7 weeks left.
a real bother was taht i couldn't get my hands on the priest in charge of the church where i wnted to film some of my scenes. i went on the first thursday of the holidays and found out he'd be gone for the week, and he wasn't there either on the following thursday either (the day before filming) but i did manage to get on the phone with him on friday night (after filming) and got the ok.
in the meantime.. is houldn't have left it so late to work on the script, i should've at least allowed my actors to learn it rather than showing them on the day. one also could not make it so i had to bring in a sub from ext2 class, i knew this was gonna be the first take anyway, and we would re-do it all anyway, this was all just for test.
in the end i didn't script the whole thing, since we wouldn't be in the chruch anyway, so i made an alternative script (not as long though) and it was tough not being able to write dialogue between teenage girls. so i asked around for some help, and got some, in fact i got quite a bit of other insight also.
this holidays was also useful for watching and reading other texts taht helped me, mind you.
anyway, on the day of filming, my tripod was misplaced so i went ahead with handheld, but my actors arrived late, half an hour and about an hour respectively. but ultimately, we got all the shots done from the script down, but next time it'd be a good idea that they see the script prior to the day. much prior to the day.
i edited the film on the weekend before school commenced, but i didn't get it finished due to other assignments. but so far, things are looking well.
noone has given any negative feedback, at least none of the people i shwoed yesterday (including the teacher) i was afraid it would be too cliche or too angst, or both. but that's also what i'm afraid of. noone is being particularly critical of it, but i suppose we should wait for my day to be analyzed by everyone. but perhaps it's good because it just seems like a regular movie.. i dunno.
the teacher gave quite a bit of advice. for one, i should make a script then find location to suit it, instead of finding location then scripting based on that. secondly, the teacher has a boom mike if i need it, if wind is a problem, or echos.
i did have this idea about deaf and blind people though.. but i've already begun with this. perhaps i should ask around before i get too deep into this. but time is running out. only 7 weeks left.
math (0420) - GeoDer: stationary point
GEOMETRY OF DERIVATIVE
or
GEOMETRICAL APPLICATIONS OF CALCULUS
yay..
at point where curve slopes upwards, tangent has positive gradient and y increases as x increases, therefore f(x) increases
at point whre curve slopes downwards, tangent has negative gradient and y decreases as x increases, therefore f(x) decreases
at the turning point or stationary point, the tangent's gradient = 0 and f(x) is stationary
also, differentiation a function twice gives the concavity of the graph at that point
or
GEOMETRICAL APPLICATIONS OF CALCULUS
yay..
at point where curve slopes upwards, tangent has positive gradient and y increases as x increases, therefore f(x) increases
at point whre curve slopes downwards, tangent has negative gradient and y decreases as x increases, therefore f(x) decreases
at the turning point or stationary point, the tangent's gradient = 0 and f(x) is stationary
also, differentiation a function twice gives the concavity of the graph at that point
ag (0420) - Animal: muscle, bone & fat
calves are born with muscle, bone and fat.
when they are born, skeleton is well developed, muscle is poorly developed and the calf has very little fat.
over the first 36 months, muscle develops rapidly, bone development is steady and fat development gradually rises
as an animal goes beyond maturirty, its muscle abd bone development is complete and will lay down excess fat if not fed carefully
when they are born, skeleton is well developed, muscle is poorly developed and the calf has very little fat.
over the first 36 months, muscle develops rapidly, bone development is steady and fat development gradually rises
as an animal goes beyond maturirty, its muscle abd bone development is complete and will lay down excess fat if not fed carefully
Monday, April 12, 2010
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