torque (measured in Nm) is a rotational.. force? calculated using the formula:
T = Fd
where T = torque in Nm
F = force in N
d = distance in m
in particular situations where applying maximum force still doesnt cause any torque (rotation) the distance (radius) has to be increased eg. lengthening a spanner to twist bolts
in a motor.. this torque is produced in a coiled current-carrying conductor, because of the motor effect. however, if the current was going in the same direction in the wire, by the time it rotates 180*, the current would be going the other way in relation to the magnetic field, so it would turn the other way. in order for the coil to keep rotating, the current must be pushed in the other direction.
Sunday, February 28, 2010
bio (0224) - BoL: pentadactyl limb
today was about observing the similarities in the forelimbs of different organisms, to be specific.. the pentadactyl limb. these similar bone structures suggest that these animals evolved from a common ancestor, but adapting to suit their environment.
generally it consisted of a humerus, an ulna and radius, a carpal and 5 digits (fingers/toes, etc)
mammals, birds, reptiles and amphibians share this common feature.
generally it consisted of a humerus, an ulna and radius, a carpal and 5 digits (fingers/toes, etc)
mammals, birds, reptiles and amphibians share this common feature.
phys (0224) - M&G: F = BIlsin@
we went over a formula that calculates the force experienced by a charge running throuhg a magnetic field.
F = BIlsin@
where F = force in newtons (N)
B = strength of magnetic field in teslas (T)
I = current in amperes (A)
l = length of wire in metres (m)
sin@ = sine of theta.. which is @.. the angle of the wire against the field
F = BIlsin@
where F = force in newtons (N)
B = strength of magnetic field in teslas (T)
I = current in amperes (A)
l = length of wire in metres (m)
sin@ = sine of theta.. which is @.. the angle of the wire against the field
ext2 (0223) - day 11: results
hurray for ext2 eng -.-
another lesson of wondering what to do, another hour or so sitting around.
this time it was in anticipation of our marks, marks that only people who did something got.
at this stage i'm just wondering.. what.. coz i really.. dont know. i'm just lost now.. especially after that.
here i thought everything was peachy.
so apparently i should've put every little exact thing into my journal.. who was the moron who said that it had hardly any impact on our mark -.-
i dont know and what i'm supposed to post right now, if anything it's more a reflection than anything else productive.
same thoughts and pondering as usual, my post-ext2 dog walk has led me into wondering about the kind of people who live in the houses i see. but perhaps none of this stuff is actually relevant or useful -.-
looking at my dog made me think of animal references. i thought instnatly.. of toraodora. the battle between tiger and dragon. perhaps i could look this up, and base my thing around that.. make it full oriental.
kind of goes against luke's catholicism though.. unless the one who's telling him about this thing, this lesson of yin and yang is a taoist.
then i'd have to look up the mechanics of taoism.
but i dont know.. i really dont know if now's the time to start doing these things.. something i shoulda done before.. but i can't look back.. only forward.
i can write some kind of script or storyboard by the end of the term, hell i can write one by the end of tomorrow. but as discussed last week.. it's about doing it.. not thinking it.
another lesson of wondering what to do, another hour or so sitting around.
this time it was in anticipation of our marks, marks that only people who did something got.
at this stage i'm just wondering.. what.. coz i really.. dont know. i'm just lost now.. especially after that.
here i thought everything was peachy.
so apparently i should've put every little exact thing into my journal.. who was the moron who said that it had hardly any impact on our mark -.-
i dont know and what i'm supposed to post right now, if anything it's more a reflection than anything else productive.
same thoughts and pondering as usual, my post-ext2 dog walk has led me into wondering about the kind of people who live in the houses i see. but perhaps none of this stuff is actually relevant or useful -.-
looking at my dog made me think of animal references. i thought instnatly.. of toraodora. the battle between tiger and dragon. perhaps i could look this up, and base my thing around that.. make it full oriental.
kind of goes against luke's catholicism though.. unless the one who's telling him about this thing, this lesson of yin and yang is a taoist.
then i'd have to look up the mechanics of taoism.
but i dont know.. i really dont know if now's the time to start doing these things.. something i shoulda done before.. but i can't look back.. only forward.
i can write some kind of script or storyboard by the end of the term, hell i can write one by the end of tomorrow. but as discussed last week.. it's about doing it.. not thinking it.
phys (0222) - M&G: magnetic fields
MOTORS AND GENERATORS
hurrah new topic, and just when iw as getting used to space and special relativity and whatnot.
so. motors and generators.
the motor effect is a force experienced by a current-carrying conductor in a magnetic field.
the right-hand palm rule is important. ie. our fingers represent a magnetic field, our thumb represents a perpendicular current, and the "force" comes out of our palm.
magnetic fields are produced from and around magnets and electrical currents, and things like solenoids.
a magnetic field is a region.. something something about forces. LAWL i better check up on that. but yeah.
fields travel from north to south on a magnet always, and what makes solenoids different is they have a field within them as well.
hurrah new topic, and just when iw as getting used to space and special relativity and whatnot.
so. motors and generators.
the motor effect is a force experienced by a current-carrying conductor in a magnetic field.
the right-hand palm rule is important. ie. our fingers represent a magnetic field, our thumb represents a perpendicular current, and the "force" comes out of our palm.
magnetic fields are produced from and around magnets and electrical currents, and things like solenoids.
a magnetic field is a region.. something something about forces. LAWL i better check up on that. but yeah.
fields travel from north to south on a magnet always, and what makes solenoids different is they have a field within them as well.
ag (0222) - Animal: ruminants & monogastrics
ruminants eg. cow, sheep, goat, etc have 4 stomachs. they have bacteria living inside these stomachs to help them digest, and then they digest the bacteria and obtain more nutrients and proteins from them too.
ruminants, unlike monogastrics can obtain energy from cellulose (fibre) whereas monogastric organisms only feel full from eating fibre, they cant digest cellulose.
monogastric organisms eg. pig, poultry, horse, people, etc have just one stomach where they digest everything. i guess they're more.. omnivorous too. but they dont have all the bacteria and stuff too.
they have to obtain protein from eating food with protein, meat i guess, or protein pellets for intensively housed animals such as pigs and poultry.
ruminants, unlike monogastrics can obtain energy from cellulose (fibre) whereas monogastric organisms only feel full from eating fibre, they cant digest cellulose.
monogastric organisms eg. pig, poultry, horse, people, etc have just one stomach where they digest everything. i guess they're more.. omnivorous too. but they dont have all the bacteria and stuff too.
they have to obtain protein from eating food with protein, meat i guess, or protein pellets for intensively housed animals such as pigs and poultry.
phys (0219) - Space: E = mc^2
related to mass dilation again..
this goes against what chemists say about matter not being able to be created nor destroyed, but einstein suggests that matter can be turned into energy, and energy into matter, at the speed of light of course.
because as speed increases, mass increases (mass dilation) so the faster you are, the heavier you are. so imagine being at lightspeed, mass would be ginormous man. i dunno what i can say about this formula, i'm not einstein hahaha.
basically.
E = energy
m = mass
c = speed of light
and the ^2 is significant coz it makes the numbers really big. and that's actually true hahaha.
this goes against what chemists say about matter not being able to be created nor destroyed, but einstein suggests that matter can be turned into energy, and energy into matter, at the speed of light of course.
because as speed increases, mass increases (mass dilation) so the faster you are, the heavier you are. so imagine being at lightspeed, mass would be ginormous man. i dunno what i can say about this formula, i'm not einstein hahaha.
basically.
E = energy
m = mass
c = speed of light
and the ^2 is significant coz it makes the numbers really big. and that's actually true hahaha.
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