[QUOTE=sltungle;32740734]Oh... duh. Wow, I can't believe I missed something that blatantly obvious :v: Massive fail on my behalf.
Geeze, I guess I'm just not in a uni-mood at the moment. Had my last class of first year yesterday so I'm completely out of it :v:[/QUOTE]
My last class is friday, though I've gotta do some courses in summer as I started the course second semester, really looking forward to next year, then i get to pick quantum physics and shit. What degree are you doing? I've got a double major of maths + physics.
[QUOTE=ThisIsTheOne;32741212]My last class is friday, though I've gotta do some courses in summer as I started the course second semester, really looking forward to next year, then i get to pick quantum physics and shit. What degree are you doing? I've got a double major of maths + physics.[/QUOTE]
I would have loved to do Maths + Physics but I don't believe such a double degree was offered.
I'm doing a double degree in Applied Science (Physics) and Nanotechnology. Although after my bachelors I intend to do a Ph.D in theoretical physics instead.
[QUOTE=sltungle;32740186]I posted for help on the Physics Forums too but surprisingly that place is fucking useless half of the time. [/QUOTE]
Not unless someone has posted the same question you have already. That place has been a lifesaver countless times for me.
Let's assume Earth were separated into 8 parts, 4 Per North/South Hemispheres, and they were separated at a length of 10 Kilometers apart from their adjacent parts
If I jump in between 2 pieces, will I fall back at 1/8 gravity, or will the 1/8 gravity allow me to jump high enough to be affected by the gravity of the adjacent piece and be pulled in its direction? Could I reach an equilibrium?
Are they any colorblind chemists that know how to read a universal pH indicator? I know I can't, therefore I need help reading it.
Taking Chemistry 12 so I can take something medical in uni. Already got Biology 12.
Any recommendations?
[QUOTE=Cows Rule;32754039]Let's assume Earth were separated into 8 parts, 4 Per North/South Hemispheres, and they were separated at a length of 10 Kilometers apart from their adjacent parts
If I jump in between 2 pieces, will I fall back at 1/8 gravity, or will the 1/8 gravity allow me to jump high enough to be affected by the gravity of the adjacent piece and be pulled in its direction? Could I reach an equilibrium?
Are they any colorblind chemists that know how to read a universal pH indicator? I know I can't, therefore I need help reading it.[/QUOTE]
Separating chunks of the Earth by that little a distance will have no noticeable effect on gravity. Gravity will be just the same over the gaps as it was before there were no gaps. Large masses can be treated as (because they act as) point masses. You treat the Earth as though all of its mass were concentrated into a point at its center and that's how you do calculations pertaining to gravity.
As such, even if you separate them (unless it's by an astronomical distance) the combined mass of the Earth parts will be at the centre of the sphere that you can trace around them, and because you've not really extended the radius of said sphere by too much (10.7 kilometres or so if I did my geometry correct), it's not going to noticeably effect the gravity.
Things don't have to be attached to one another for point masses to work. Hell, if you wanna be technical I don't think ANYTHING in the universe is really physically attached to anything else. Atoms don't really touch when they bond (unless you want to treat the probability cloud around an atom as a solid shell). I'm pretty certain protons and neutrons don't actually physically touch in the nucleus. Molecules don't really touch either (again, unless you treat the probability cloud as a solid object). And because you don't need things to touch that's why things like orbit work, and why you can have binary star systems. Two objects rotate around a common center of gravity.
[QUOTE=Cows Rule;32754039]Are they any colorblind chemists that know how to read a universal pH indicator? I know I can't, therefore I need help reading it.[/QUOTE]
speak to the people who manage your lab and explain the situation - you'll realistically probably have to use an electronic probe of some sort, which is inconvenient but at least you'll know what you're doing.
There is no gravity at the center of the earth.
Imagine having a base there.
[QUOTE=ultra_bright;32772804]There is no gravity at the center of the earth.
[/QUOTE]
Speaking of this. Has anyone ever calculated how big the area would be in which there would be no gravity.
Would it be like 1 square meter or much more?
[QUOTE=ultra_bright;32772804]There is no gravity at the center of the earth.
Imagine having a base there.[/QUOTE]
Technically at the exact center of the Earth there shouldn't be any net gravitational pull (I mean if you assumed Earth to be a perfect sphere, and all of the matter throughout it to be uniform in density - both assumptions being wrong of course), but for the purpose of physical calculations large masses, charged masses, stuff like that, the origin of the force in question can be treated as having come from a dimensionless point at the center of the body in question.
[editline]14th October 2011[/editline]
[QUOTE=booster;32776653]Speaking of this. Has anyone ever calculated how big the area would be in which there would be no gravity.
Would it be like 1 square meter or much more?[/QUOTE]
It'd be a volume, not an area. In theory the same, dimensionless point at which the mass of the Earth can be imagined to be concentrated at would be the only point with a net gravitational pull of zero. However, in practice I'm guessing there'd be a fairly large volume (hundreds of cubic metres or more maybe - maybe even dozens of cubic kilometres) in which the net gravitational force would be so low that you wouldn't notice it.
okay
[img]http://i.imgur.com/MhvBt.gif[/img]
is this fake, and if not, how the fuck does it work
to me it looks like that ball should just fly off to the right.
edit : solved, it's Bernoulli's principle staring me in the face, nice one guys
[QUOTE=Turnips5;32780268]okay
[img]http://i.imgur.com/MhvBt.gif[/img]
is this fake, and if not, how the fuck does it work
to me it looks like that ball should just fly off to the right. something to do with gyroscopic motion or am I just stupid?[/QUOTE]
It's not fake. Because the water needs to flow around the ball, the pressure around the ball increases (Bernoulli's principle) and it is pushed into the stream.
Same as holding a ball on a string next to a running faucet
[QUOTE=Overv;32780552]It's not fake. Because the water needs to flow around the ball, the pressure around the ball increases (Bernoulli's principle) and it is pushed into the stream.[/QUOTE]
ahhhhhhh
I hadn't though of that, it actually makes perfect sense, thanks
[editline]14th October 2011[/editline]
[QUOTE=JohnnyMo1;32780641]Same as holding a ball on a string next to a running faucet[/QUOTE]
yeah it's all so obvious now
thanks mod team
[editline]14th October 2011[/editline]
I feel stupid yet enlightened
[QUOTE=Turnips5;32780268]okay
[img]http://i.imgur.com/MhvBt.gif[/img]
is this fake, and if not, how the fuck does it work
to me it looks like that ball should just fly off to the right. something to do with gyroscopic motion or am I just stupid?[/QUOTE]
You can do this yourself, just get a ping-pong ball and a blowdryer.
[QUOTE=Mr._N;32781371]You can do this yourself, just get a ping-pong ball and a blowdryer.[/QUOTE]
Yeah, I've seen that before, but I didn't think about why it worked properly (probably because I was like 5 when I tried it)
Alright, I'm having trouble with a quantum mechanics problem. It's about the harmonic oscillator, and I have no idea where to start. Can someone point me in the right direction?
[IMG]http://oi54.tinypic.com/299cat.jpg[/IMG]
I got a 109% on my physics test, and the class average was an 83
I don't get how people don't understand the simple physics that we're currently learning
[QUOTE=Jo The Shmo;32784702]I got a 109% on my physics test, and the class average was an 83
I don't get how people don't understand the simple physics that we're currently learning[/QUOTE]
good for you
what stuff are you learning about currently?
[QUOTE=Jo The Shmo;32784702]I got a 109% on my physics test, and the class average was an 83
I don't get how people don't understand the simple physics that we're currently learning[/QUOTE]
Is that extra credit?
On my year 11 exam, the extra credit question was "List 5 jokes or puns made by your physics teacher"
yeah there was a ton of extra credit and it was all easy-as-fuck kinematics
i mean really it was the very first physics test ever and it was all so simple
its supposed to be an ap class but people just aren't learning it
[editline]14th October 2011[/editline]
its sorta annoying, what if he sucks at preparing us for the ap?
I will be used to acing his simple tests and then I will turn around and get a 1 on the AP
[QUOTE=Jo The Shmo;32785536]yeah there was a ton of extra credit and it was all easy-as-fuck kinematics
i mean really it was the very first physics test ever and it was all so simple
its supposed to be an ap class but people just aren't learning it
[editline]14th October 2011[/editline]
its sorta annoying, what if he sucks at preparing us for the ap?
I will be used to acing his simple tests and then I will turn around and get a 1 on the AP[/QUOTE]
hmm
do you know what's gonna be on the exams, like do you have a syllabus or something to look at? living in the UK, I'm not familiar with AP exams
not yet exactly, they aren't until May
I'm sure I'll get an idea of what I need to know by then, but who knows how well he will teach us
he probably knows what he's doing even if it doesn't immediately seem like it
I haven't learned any fundamentally new physics theory in my first 2 weeks at university
First two weeks? Jesus. I started almost 2 months ago.
Right now in mechanics we're covering coupled harmonic oscillators which I learned in math methods for physics a year ago so none of that is new.
[QUOTE=Jo The Shmo;32785536]yeah there was a ton of extra credit and it was all easy-as-fuck kinematics
i mean really it was the very first physics test ever and it was all so simple
its supposed to be an ap class but people just aren't learning it
[editline]14th October 2011[/editline]
its sorta annoying, what if he sucks at preparing us for the ap?
I will be used to acing his simple tests and then I will turn around and get a 1 on the AP[/QUOTE]
At least your school has an AP physics. My school focuses on the arts, so we have tons of drama and art classes, and thusly most of our AP classes are history, AP studio art, or AP art history. We also have an AP literature and AP language. Oh and Latin.
I hate my school. I have been thinking of self studying for AP physics and signing up for the test at another school, I'd have to pay for it though. I'm already planning to take the SAT Subject Test for physics and take college physics at the local community college, so I don't know if I should bother with the AP exam.
More on topic is that my class has been learning kinematics as well and I received a 105% on the last test while the next highest in the class was ~90%. I also am pretty sure I got a 100% or 105% on the test I took Friday.
Even worse than the scores themselves is that I like to derive the formulas on my own so I get an understanding of how they come about, can be manipulated, and so on, but everyone else just uses them off the board (they're all listed on the whiteboard while we take the test), yet I still scored significantly higher.
P.S. You can freely learn a lot of what you would need to know for the AP physics test. Check out an AP Physics review book at the library, they probably have one if your school has AP physics as a class, or simply use your class textbook, and use some websites. I like to watch Khan Academy videos regularly. [url]http://www.khanacademy.org/#physics[/url] I also enjoyed the Physics 10 playlist from Berkeley, but it doesn't tend to go into the math at all, so its simply the concepts. But significant portions of the SAT II physics and the AP physics test are conceptual anyway, so it still helps. [url]http://www.youtube.com/playlist?list=PL095393D5B42B2266[/url] Lastly is the sparknotes SAT Physics book. I haven't read through it yet, but if you like it you can go ahead. [url]http://www.sparknotes.com/testprep/books/sat2/physics/[/url]
[QUOTE=JohnnyMo1;32788716] math methods for physics [/QUOTE]
I'm currently taking this class and the prof is utter shite. He has a weird fetish for cats and likes to use cats constantly in his examples. He nicknames his written notes for the class "dry catfood" and his spoken lectures "wet catfood." Also, the homework problems he writes up himself and assigns are called "paw problems" and a little drawn paw appears at the top of every photocopy.
On top of that, he is a pretty vulgar and weird person. We were going over fluid mechanics and he decides to use the diffusion of "pee pee particles in the toilet" as an example.
[QUOTE=JohnnyMo1;32788716]First two weeks? Jesus. I started almost 2 months ago.
Right now in mechanics we're covering coupled harmonic oscillators which I learned in math methods for physics a year ago so none of that is new.[/QUOTE]
Sounds tedious. I've been at university for 3 weeks, but obviously I can't remember half of one of those
[QUOTE=Mr._N;32791144]I'm currently taking this class and the prof is utter shite. He has a weird fetish for cats and likes to use cats constantly in his examples. He nicknames his written notes for the class "dry catfood" and his spoken lectures "wet catfood." Also, the homework problems he writes up himself and assigns are called "paw problems" and a little drawn paw appears at the top of every photocopy.
On top of that, he is a pretty vulgar and weird person. We were going over fluid mechanics and he decides to use the diffusion of "pee pee particles in the toilet" as an example.[/QUOTE]
Speaking of professors. Here's a post I made in the mod section, probably fits better here:
Got the best mentor ever. He's 69 years old. Isn't actually allowed to teach as he is a pensioner but still come to the school and acts as a professor. He isn't allowed to set grades either as he technically isn't a teacher now, so he let other professors sign his papers. So basically he acts like a real professor, but other professors are signing his papers :v:
He's not getting any salary but gets money from his retirement plan. And he says that somehow the principal hasn't found it out or simply doesn't care. He's called the ghost teacher by some people :v:
Demonstration in 2009 when he officially got fired/retired by the principal.
[IMG]http://i.imgur.com/b7HNo.jpg[/IMG]
Acting like a boss during a linear algebra lecture
[IMG]http://i.imgur.com/wvaJk.jpg[/IMG]
[QUOTE=Mr._N;32791144]I'm currently taking this class and the prof is utter shite. He has a weird fetish for cats and likes to use cats constantly in his examples. He nicknames his written notes for the class "dry catfood" and his spoken lectures "wet catfood." Also, the homework problems he writes up himself and assigns are called "paw problems" and a little drawn paw appears at the top of every photocopy.
On top of that, he is a pretty vulgar and weird person. We were going over fluid mechanics and he decides to use the diffusion of "pee pee particles in the toilet" as an example.[/QUOTE]
what the fuck
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