what i learned in physics today...

[Holly]

I like physics. Of course that was kinda my college major so I'm biased.

Venti, it's kinda contradictory to like physics and hate math since math is a huge part of physics. I used to say I didn't like math in high school but later in college I found that I'm good at math.

btw, that lifting exercise against the wall just proves the other benefits of breasts. Sorry I just couldn't resist. LMFAO

noooo... its not steve! lol. cause i'm taking regular physics which has basically no math it it at all! just simple formulas like F=MA

Holly I'm sure you've tried this but I thought I'd post it either way because its fun AND weird...

Go stand in a door way with your arms at your sides, palms towards you hips.

Now push the backs of your wrists and hand against the inside paneling of the door as hard as you can for a minute or so.

Lightly let your arms fall to your sides, but here's the thing: THEY WON'T!!! If you don't force them still, your arms will RAISE!!!

Its awesome!

lol! i love that expiriment! its cool!

and if you take 2 foot steps backward away from a wall (while your're facing it) and lean over so the top of you're head touches the wall and try to pick up a medium sized, but not heavy, (like a box or a small chair) thing. girls can do this... but guys cant!

doing that hurts my head

awww... lol. well you have to be careful when you put your head against the wall not to bang it.... use your hands and go slow. one of my friends banged her head doing it too. it was funny, cause she wasnt hurt.

[Holly]

ooops... double post  :oops:

[Ms.Redd]

PETE! The "going through the floor" thing is always a fun thing to do at goofy get togethers!!!

Are there any other ones along these lines??

[jjthefourth]

btw, that lifting exercise against the wall just proves the other benefits of breasts. Sorry I just couldn't resist. LMFAO

LMAO!!  Only you Steve, only you.

[Holly]

lol... yeah, i love physics more now! i dont know why... but i think my brain works well with physics, cause for once in my life i actually feel smart!
i wasnt at school on friday when my teacher announced a test that would be on monday, so come monday, i knew i was screwed, lol. but i took it as best i could, knowing i probably failed. there were 10 questions, and the average people got right was 4.7, so he decided to multiply the score by 3 and make it out of 20 points. i got a 7!!! which means a 21 outta 20!    that definatly made my day!! lol. i got the highest in the class. which i'm still shocked about 8O  cause i swear half of what i did was guessing.. talk about luck!

[sayyouwould]

ohh you're taking physics?? this is great!! now I know where to come for help!! I'm doing soooo bad in physics.I have like a C+ it's terrible!!

[Holly]

ohh you're taking physics?? this is great!! now I know where to come for help!! I'm doing soooo bad in physics.I have like a C+ it's terrible!!

aww... well if i can help you, i will! what are you learning now?
but i may not be too good... cause i still convinced by doing good is by luck, lol.

[badsrx7]

Oh man, I've got one huge physics test tomorrrow.

:X

[sayyouwould]

I'm not sure what it's called. here is the question.


A ball is thrown 50 m/s at 15 degrees above horizontal,then 30 deg,45 deg,60 deg, and 75 deg avove horizontal. What vertical distance(height) and horizontal distance does the ball travel each time?


1.Draw the vertical and horizonral components of each vector.-done

2.Measure and use the scale(1 cm=10m/s) to determine the balls initial vertical and horizontal velocities.-done just need to scale.

3. t=2(v/g) inital vertical velocity-have no clue where the time came in thats whats confusing me

4.horizontal distance=v*t    v=horizontal velocity- huh?? lol

5. vertical distance=1/2g(t/2) sqaured-what??

If you could help me along I would be very happy!!

[Holly]

I'm not sure what it's called. here is the question.


A ball is thrown 50 m/s at 15 degrees above horizontal,then 30 deg,45 deg,60 deg, and 75 deg avove horizontal. What vertical distance(height) and horizontal distance does the ball travel each time?

yeah! we were doing this at the beginning... and it is very confusing! i admit!
*drags out Physics notes* lol

ummm... ok,

well you know you have to make a right triangle with the verticle and horizontal parts, and i dont know how i'm going to explain this without drawing it to show you, but  i can try!

anyways... first you have to find the measurent of the horizontal (H) component which you use cosign for!

i'll do the 15 degrees one for you

so you get...
cos15= H
.......... 50 m/s
H= 50 m/s x cos15
H= 48.3

and now for verticle (V) use sin
sin15= V
..........50 m/s
V= 50 m/s x cos15
V= 12.9

so for 15 degrees you get a total horizontal distance of 48.3m and a total vertical distance of 12.9m

i hope that helped some!!!!! i'm horrible with explaining things to people! just do the 30, 45, 60 and 75 degree angles the same way! just substitute the 15's with whatever angle you're doing!

tell me if you have any more questions!

[skyestar]

i like physics. havent been to school in forever tho. **breaks out into tears** but it rocks!! thank you for actually teaching me something!  

[Holly]

ooo.. and if you're having a hard time remembering what sin and cos sin are, remember:
 SohCahToa=
Sin= opposite over hypotenuse
Cos Sin= Adjacent over hypotenuse
Tangent= opposite over adjacent

you understand why you use them right?
when you make your horizontal (being the ground) and vertical (being the height) components you get 3 sides of a right triangle along with the ray of 50 m/s being the hypotenuse. and 15 degrees is the one angle you have of this triangle. so to find the horizonal you need to do Cos meaning the adjacent over the hypotenuse (which you are giving)

damn... i wish i could draw it for you!! lol

[Holly]

i like physics. havent been to school in forever tho. **breaks out into tears** but it rocks!! thank you for actually teaching me something!  

aww... you miss school and physics?! lol  8O
well i'm not sure whether you're talking about my expiriments i talked about in the beginning or my explanation i just did, but i'm glad i could teach you something!!  

[Holly]

oh Shelly! i got an idea...
if you need a visual, i can draw it on paint on my comp and either im it to you or someone could host it! but i cant host things

[LimeTwister]

ooo.. and if you're having a hard time remembering what sin and cos sin are, remember:
 SohCahToa=
Sin= opposite over hypotenuse
Cos Sin= Adjacent over hypotenuse
Tangent= opposite over adjacent

my geo teacher was lovey and refused to tell us about SohCahToa...and i still don't know how to do it...but i passed.