# frostbite

Senior Members

45

## Posts posted by frostbite

### Implicit Diff.

Depending on how you interpret the question, its B, if they happen to all know the answer, or there is no answer if they don't know the answer.

indeed, it is B. hehe! awww... how come no one laughed at my joke... nah! it was not even a joke. 'twas just a stupid post..

### Implicit Diff.

If y=x + sin(xy)

dy = dx + cos(xy)*(ydx + xdy)

dy(1 - x*cos(xy)) = dx(1 + y*cos(xy))

so y'= (1 + y*cos(xy))/(1 - x*cos(xy))

yep

wahehe!! i like your signature. hehe!! so who's lying among the three (A, B, C)? hehe!! i bet its D!

wew! thanks!

### tesla's inventions

hmm.. since were already on the topic of ionosphere, tesla etc. is it possible to transmit electric charges directly to the ionosphere? lightning strikes downward right? can we reverse this?

### Why can you blow a small flame out?

yes, i guess its more on the heat removal rather than drowning it with CO2. your breath is at a lower temperature than the flame. your breath gets some of the heat from the flame. and this action makes the fire triangle or fire tetrahedron crumble.

### calculus exams

does anyone of you know any online calculus exams? please, if you do know one, put the website or URL. its summer here and i can't go inside our school library cause i'm not yet a "registered" student. and i can't go to our public library since i still have a standing balance there. heehhe!! please help. i tried google and i did not find what i was looking for.

### Implicit Diff.

Don't do that then. Use implicit differentiation, as the title of the thread suggests. The derivative of the left-hand side is simply dy/dx. Use the chain rule to get an expression involving dy/dx on the right-hand side. Collect terms and solve for dy/dx.

yeah.. that's how to get the answer.. I guess..

y = x + sin(xy)

dy/dy = 1 + cos(xy) * (y + x dy/dx) (Use of Chain Rule)

dy/dx = 1 + y cos(xy) + x dy/dx cos(xy)

[dy/dx-(x dy/dx cos(xy))] = 1 + y cos(xy)

dy/dx [1 - x cos(xy)] = 1 + y cos(xy) (simplifying the equation we arrive to..)

dy/dx = [1 + y cos(xy)]/[1 - x cos(xy)] ---> my answer...

hope its correct.. hek hek hek!! xiao!

### Implicit Diff.

If y=x + sin(xy) then dy/dx equals....

I don't understand how you take the derivative of sin(xy).

I think you have to use the multiplication rule and get x dy/dx + y

But what do you do from there?

your function is quite hard to answer since it will go on a circle. if we try to substitute y in x + sin(xy) we still have y. it is also quite hard since we have two variables. though i haven't answered it yet, these are some of my points regarding your question. i'll try to solve this later. hope i can answer it. till next time!

### Chemical Ozone synth?

hey, are you trying to synthesize the molecules in the ozone layer? that's great.. i was planning a project like this for a science fair. but unfortunately it was kind a hard for me so i switch to biodiesel instead. but for your question.. i'll try to investigate. you did not mention any violent reactions in the flask so i take it as "safe." but for the ozone headache.. i'll take note of it. i'll be careful.

### Is it normal for the moon to appear blood red?

No. Orange means the apocolypse is coming.

hehehe! nice one!

its only the sun that sometimes appears red right?

### Is it normal for the moon to appear blood red?

this is due to the differnt refractive index depending on the wavelength of the light (red light is defracted towards you, everything else away), but with the moon as stated above it's also likely to be polution in the atmosphere :s

yes, pollution may be of a factor as to why it behaves like so. but i saw a red colored moon on the horizon when i was in the beach once. i guess i'll still go with the refractive index/ index of refraction. but i'll try searching on possible pollutants dispersed on the air that contributes to this phenomenon.

### how do blind people dream?

I find this very hard to believe. It is the reader's digest, so they may just be talking crap, but are you sure you didn't misunderstand what they were saying?

i did not misunderstand it. in fact, that's how it was said. wew! talk about plagiarism. toinks!!

Yes' date=' blind people do have dreams. However, those blind since birth or very early childhood have no visual imagery in their dreams. Instead, they experience a very high percentage of taste, smell, and touch sensations in their dreams.

The breakdown is as follows:

There are no visual images in the dreams of those born without any ability to experience visual imagery in waking life.

Individuals who become blind before the age of five seldom experience visual imagery in their dreams.

Those who become sightless between the ages of five and seven may or may not retain some visual imagery.

Most people who lost their vision after age seven continue to experience at least some visual imagery, although its frequency and clarity often fade with time.

experience of vision first is needed before it can be translated into a dream. Those blind for a lifetime instead experience other keenly developed senses in their dreams--i.e., the sensation of moving around, the emotion of joy, etc.

Dream images of the blind instead seem to be reconstructions of objects based on sensory input such as touch and sound, just as occurs in waking life. Some images are constructs based on input from other senses (and on what the dreamer has been told by the sighted about what these objects look like).

so instead of sight they feel, taste and smell. i'll try to find more facts for this matter. thanks for the informations guys.

### how do blind people dream?

after reflecting over what i read about blind people. something suddenly popped in my mind. "HOW DO BLIND PEOPLE DREAM." its quite vague since they can't see anything, so how do they go about dreaming?

i found an article on the reader's digest which says that they inherit their dreams from their parents who, if not like them, can see. this further lead me to another question: "Dreams come from the subconscious part of the mind right? so the subconsciousness of a person can be inherited? but stilll i'm not satisfied since its just me putting "facts" together. I'd like to hear your opinions and ideas about this.

### Is it normal for the moon to appear blood red?

i guess its because of its angle of elevation. like that of the sun during sunsets and sunrises.

### Why is it bad to prescribe antibiotics for viruses?

well another thing aside from developing resistance against the medicine is its spectrum of activity. lets take for example cefalexin. this cefalexin when taken is not like a heat-seeking missile that will only 'seek' its locked target. the medicine is like smoke that will engulf anything within the vicinity of infection. so that means even your lymphocytes trying to fight the infection. and if this will be applied to your statement, then your only killing your bacteria or worst -yourself. hehe!

### Earth almost distroyed last monday (??!?!?)

phew! Thank goodness it missed!

### Plants digest food???

The breakdown:

Venus flytraps - native to North Carolina in the US' date=' introduced to New Jersey

Cobra plants - Oregon / North California only

American pitcher plants - Eastern north america, from FL into southern Canada

Sundews, butterworts, bladderworts - All coninents except Antarctica, from swamps to deserts

Sun pitchers - South America

Asian pitcher plants - Asia, Australia, Indonesia, one species in madagascar.

There's assorted others, but I'll no go into all of those.

Correct, they get energy from sunlight like most plants. They capture insects for minerals and nutrients they can't get from the soil (carnivorous plants evolved carnivory to deal with very low nutrient soils). They need insects, but not more than a few a year.

Of course, more bugs are good; my flytraps are all outdoors, eat like gluttons, and as a result last year I was able to divide my one flytrap into 4 plants, all of which are thriving.

Mokele[/quote']

soo.. they do digest their food right( i mean like offcourse, how do they absord the nutrients)? but without the help of a digestive system. that's how i deduce the replies above.

oooohhh!!! i want a venus-fly trap tooo!!! judging from your statements i can see its very cooooollll!!! seeing it catch a fly or any insect for the matter is soo outstanding (i have n't actually seen a flytrap in front of me all my life -except for the books and the television- i want one!! hehe!!)

### Plants digest food???

yes, they do. think about the carnivorous plants, venus-flytrap and the pitcher plant from Amazon (err.. was it from the amazon?).

### Who first discovered/pointed out Earth's magnetic field?

hey... i have a question regarding on earth's magnetic sphere. its been quite bugging me ever since i got it in my physics exam. physicists say that the actual north of the earth is actually the south and that the south is actually the north. i don't quite understand it. i'm sorry for the abrupt question. i'll try to get the given question (from my physics teacher) and i'll try to post it next time. i hope i kinda gave you some idea.

### physics experiments

my suggestion, try the sodium metal + water trick. its violent but it will surely stir the whole class. hehe!! sorry its not physics.

### Alternate fuel from microbs?

its not only methane that powers those cars.. its actually a combination of propane, butane and methane. methane has a low octane rate and it will be impractical to use it for internal combustion that is why it is mixed with some other alkyl groups to increase the octane content.

i have a suggestion with regards to the "dump-site- collecting-methane-idea", why not collect some stool (a.k.a. human wastes,not sure on the spelling of "stool", sorry) and condemn it in a container, say a septic tank, and gradually collect the methane produced by the methanogens from the baffles or i think they call it exhaust pipes... if you like, try to search it... my memory is kinda misty. hehe !

xiao!

### unexplained nosebleeds

i guess i'll go with the stress idea of the nosebleeds.. hehe!! i'm so fortunate not to have nosebleeds since i was a baby!! wohhooo!! thx GOD!!

### unexplained nosebleeds

After haveing random nosebleeds twice recently (lastnight and just now) i have to wonder if there is a cause to these. both times i've just been sitting around and then i have a nice big bloodstain on my t shirt. this isn't normal for me either its been about 4 years since i last had a nosebleed and thats because i got kicked in the face.

um.. could it be that you are experiencing slight thrombocytopenia? perhaps you have a weak blood vessel in the internal cavities of your nasal passages. and because of thrombocytopenia you experience "nose bleeds"

*Thrombocytopenia (or -paenia, or thrombopenia in short) is the presence of

relatively few platelets in blood.

Signs and symptoms

Often, low platelet levels do not lead to clinical problems; rather, they are

picked up on a routine full blood count. Occasionally, there may be bruising,

nosebleeds and/or bleeding gums.

It is vital that a full medical history is elicited, to ensure the low platelet

count is not due to a secondary process. It is also important to ensure that

the other blood cell types red blood cells, and white blood cells, are not also

suppressed.*

*http://en.wikipedia.org/wiki/Thrombocytopenia

### Giant Bat-eating Centipede Movie

whoah!! i hate anthropods!! ewww!!!! hehe!! the shark-eating octopus is sooooo awesome!!!! whoooooot!! i'd like to pet one.

### Ambidexterity

err.. i like to call it a gift(ambidexterity) rather than "brain-damaged thing". it seems that they are looking at it pesimistically.. hehe.

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