Math Problem!!!! - GoFuckYourself.com

Luc Duboi · 06-30-2003, 08:09 PM

A train is running at the speed 40 m/s , suddenly the driver pushes the brake and it reduces to -2 m/s^2 .

Question : After 30 seconds, how far can that train go ?

06-30-2003, 08:11 PM

400meters because it would have stopped @ 20 seconds

RedShoe · 06-30-2003, 08:12 PM

about 100 miles. yeah, yeah definitely about 100 miles.

Luc Duboi · 06-30-2003, 08:14 PM

scientific answer please. no guessing!!!

400 how ?

100 how ???

SpaceAce · 06-30-2003, 08:16 PM

I made this image a long time ago for another one of Luc's threads but I didn't get around to posting it. This is probably as close as I will ever get to having another chance, so here it is

<IMG SRC="http://friends.porncherry.com/images/original/aznmath.gif">

SpaceAce

06-30-2003, 08:16 PM

40 m/sec, slowing down @ 2m/sec makes it 20 secs before it reaches zero.

the graph forms a rectangle triangle with 1 side measuring 40, and the other measuring 20, to find the surface of the triangle, wich represents the distance in meters, you do (40 X 20)/2 wich gives you 400 meters.

didnt you learn anything in physics class?

Saintgames · 06-30-2003, 08:16 PM

damm metrics... how many MPH is that??

Luc Duboi · 06-30-2003, 08:17 PM

Quote:

Originally posted by SpaceAce
I made this image a long time ago for another one of Luc's threads but I didn't get around to posting it. This is probably as close as I will ever get to having another chance, so here it is

SpaceAce

you're very tricky!!!

Overscore · 06-30-2003, 08:18 PM

d=.5(a×t^2)
d=.5(-2m/s^2×30s^2)

The train will travel -900m.

Luc Duboi · 06-30-2003, 08:18 PM

Quote:

Originally posted by Saintgames
damm metrics... how many MPH is that??

m/s = meter per second.

06-30-2003, 08:18 PM

Quote:

Originally posted by Luc Duboi

m/s = mile per second.

fuck no
m/s = meters per second

what kind of thing could go @ 40MILES a second?!?!?!

CDSmith · 06-30-2003, 08:19 PM

The liquor store is 12 km from my house, and it closes at 11 pm. If I drive at 70 km/h all the way there, buy a 66'er of vodka on sale for $38.95, then drive at 60km/h all the way back, can I feasibly be drunk by midnight?

No using a calculator!

06-30-2003, 08:19 PM

Quote:

Originally posted by CDSmith
The liquor store is 12 km from my house, and it closes at 11 pm. If I drive at 70 km/h all the way there, buy a 66'er of vodka on sale for $38.95, then drive at 60km/h all the way back, can I feasibly be drunk by midnight?

No using a calculator!

the answer is definately yes

Luc Duboi · 06-30-2003, 08:20 PM

Quote:

Originally posted by bdjuf

fuck no
m/s = meters per second

what kind of thing could go @ 40MILES a second?!?!?!

ok

Luc Duboi · 06-30-2003, 08:22 PM

Quote:

Originally posted by bdjuf
40 m/sec, slowing down @ 2m/sec makes it 20 secs before it reaches zero.

the graph forms a rectangle triangle with 1 side measuring 40, and the other measuring 20, to find the surface of the triangle, wich represents the distance in meters, you do (40 X 20)/2 wich gives you 400 meters.

didnt you learn anything in physics class?

read the problem carefully.

40 meter per second reduces to minus 2 meter per second square (-2 m/s^2)

Mr.Wong · 06-30-2003, 08:23 PM

Quote:

Originally posted by bdjuf
40 m/sec, slowing down @ 2m/sec makes it 20 secs before it reaches zero.

the graph forms a rectangle triangle with 1 side measuring 40, and the other measuring 20, to find the surface of the triangle, wich represents the distance in meters, you do (40 X 20)/2 wich gives you 400 meters.

didnt you learn anything in physics class?

It's slowing down by 2 meters per second squared, not 2 m/s.

Edit: Luc beat me to it.

CDSmith · 06-30-2003, 08:24 PM

Quote:

Originally posted by bdjuf
the answer is definately yes

But having a right answer simply isn't good enough on this thread. Please illustrate the scientific formula you used to arrive at that conclusion. Please illustrate all calculations, trigonometry, calculous and vectors used.

mjrools23 · 06-30-2003, 08:25 PM

need help with your HS math hw luc?

06-30-2003, 08:25 PM

Quote:

Originally posted by Mr.Wong

It's slowing down by 2 meters per second squared, not 2 m/s.

Edit: Luc beat me to it.

meters per second squared is the general writing for of acceleration, but its slowing down @ 2 meters per second, only because its acceleration we put it squared, cuz thats how it is

ask a scientist, hell give you the same answer as me

Thrawn$ · 06-30-2003, 08:30 PM

06-30-2003, 08:33 PM

here, I made a pic for you

CDSmith · 06-30-2003, 08:35 PM

Quote:

Originally posted by bdjuf
here, I made a pic for you

Yes, yes I see now that you are right by your calculations. I absolutely CAN be drunk by midnight.

thanks :D

06-30-2003, 08:35 PM

Quote:

Originally posted by CDSmith
Yes, yes I see now that you are right by your calculations. I absolutely CAN be drunk by midnight.

thanks :D

no problem buddy, enjoy!

Mr.Wong · 06-30-2003, 08:36 PM

Quote:

Originally posted by bdjuf

meters per second squared is the general writing for of acceleration, but its slowing down @ 2 meters per second, only because its acceleration we put it squared, cuz thats how it is

ask a scientist, hell give you the same answer as me

Ok, time to school.

x= x(not) + v(not)t + .5 at^2
x(not) = 0
v(not)= 40
t = 30
a = -2
t = 30

300 meters.

06-30-2003, 08:38 PM

Quote:

Originally posted by Mr.Wong

Ok, time to school.

x= x(not) + v(not)t + .5 at^2
x(not) = 0
v(not)= 40
t = 30
a = -2
t = 30

300 meters.

your calculations show that the train would be going backwards from seconds 20(excluded) to seconds 30(included)
we both know that this cannot be true if the person uses the BRAKES

Mr.Wong · 06-30-2003, 08:38 PM

Quote:

Originally posted by bdjuf
here, I made a pic for you

a^2+b^2=c^2

Area of that triangle does not = a+b/2

06-30-2003, 08:40 PM

Quote:

Originally posted by Mr.Wong

a^2+b^2=c^2

Area of that triangle does not = a+b/2

what you are showing me is Pythagorus, that is to find the lenght of the segments...
the triangle area is represented by (A *TIMES* B)/2

Mr.Wong · 06-30-2003, 08:40 PM

Quote:

Originally posted by bdjuf

your calculations show that the train would be going backwards from seconds 20(excluded) to seconds 30(included)
we both know that this cannot be true if the person uses the BRAKES

No, it would have stopped based on the problem. Of course it's not going backwards.

Porndealer · 06-30-2003, 08:40 PM

Quote:

Originally posted by CDSmith
The liquor store is 12 km from my house, and it closes at 11 pm. If I drive at 70 km/h all the way there, buy a 66'er of vodka on sale for $38.95, then drive at 60km/h all the way back, can I feasibly be drunk by midnight?

No using a calculator!

Hell yeah, you probably left at 2pm you fuckin' alco

06-30-2003, 08:41 PM

Quote:

Originally posted by Mr.Wong

No, it would have stopped based on the problem. Of course it's not going backwards.

thats why you need a graph,

u got owned buddy, u got owned

Mr.Wong · 06-30-2003, 08:41 PM

Quote:

Originally posted by bdjuf

what you are showing me is Pythagorus, that is to find the lenght of the segments...
the triangle area is represented by (A *TIMES* B)/2

Yes, you're trying to find the length of the side, ie, the length of the train ride, not the area inside the triangle.

06-30-2003, 08:42 PM

lol
what does the lenght of that side represent?
we are trying to find the surface, wich represents the position in meters, compared to the initial position, wich is 0

Mr.Wong · 06-30-2003, 08:49 PM

Quote:

Originally posted by bdjuf
lol
what does the lenght of that side represent?
we are trying to find the surface, wich represents the position in meters, compared to the initial position, wich is 0

Dude, distance is not equaled by the surface area. Where did you learn that? Distance is equaled by the side of the hypotenuse (sp)which is why you would use the Pythagorium (sp) theorm.

06-30-2003, 08:50 PM

Quote:

Originally posted by Mr.Wong

Dude, distance is not equaled by the surface area. Where did you learn that? Distance is equaled by the side of the hypotenuse (sp)which is why you would use the Pythagorium (sp) theorm.

revise brudda, I studied in this, I know it like the back of my hand

Im honestly willing to bet any amount of money on this

BRING IT ON BITCHES

Mr.Wong · 06-30-2003, 08:53 PM

Quote:

Originally posted by bdjuf

revise brudda, I studied in this, I know it like the back of my hand

Im honestly willing to bet any amount of money on this

BRING IT ON BITCHES

Ok, let's work on this here. You graph is showing that 2m/s is the hypotenuse, when it's actually supposed to be on the X access. The hypotenuse is the distance, which you are trying to find. Agree or disagree?

06-30-2003, 08:55 PM

its not the hypotenuse, its the "pente", as we say it in french....
whats the word for english, ARGH

its Y/X, I dont know what the english word is for it

the slope I guess? (I just checked a french english dictionnary)

Mr.Wong · 06-30-2003, 08:57 PM

Quote:

Originally posted by bdjuf
its not the hypotenuse, its the "pente", as we say it in french....
whats the word for english, ARGH

its Y/X, I dont know what the english word is for it

the slope I guess? (I just checked a french english dictionnary)

The slope is the hypotenuse. Your graph is showing time as the distance. The 2 m/s should be on the x aixs, not as the slope. That's what you're trying to find.

06-30-2003, 08:58 PM

the graph is speed in the function of time

the vertical bar represents the speed in m/s
the horizontal bar represents the time in seconds
the diagonal represents the slope, wich represents the acceleration (-2m/s^2)
and the surface of the triangle represents the distance traveled

thekebie · 06-30-2003, 09:01 PM

Physics that uses numbers and calculations is gay. True Physics is all theory.

06-30-2003, 09:05 PM

Mr.Wrong
here you go

http://www.physicsclassroom.com/Class/1DKin/U1L4e.html

please read it carefully, it shows that the way I calculated is the correct way

the Shemp · 06-30-2003, 09:15 PM

06-30-2003, 09:17 PM

Quote:

Originally posted by the Shemp

mofo321 · 06-30-2003, 09:18 PM

actually it got negative decellaration
so it should go backwards

06-30-2003, 09:19 PM

Quote:

Originally posted by mofo321
actually it got negative decellaration
so it should go backwards

not in this context, because after a full brake, the train wont go backwards, it will just stop moving

cash69 · 06-30-2003, 09:31 PM

30 times farther then it was 30 seconds ago

Luc Duboi · 06-30-2003, 09:39 PM

I found interesting in BDJUF.

BDJUF, you just got yourself rekon by your greatness.

Mr. Wong. You're full of knowledge too!!!

Mr.Wong · 06-30-2003, 09:41 PM

Quote:

Originally posted by Overscore
d=.5(a×t^2)
d=.5(-2m/s^2×30s^2)

The train will travel -900m.

Didn't even see this. This is also correct. The train will travel -900m. How long would the train travel total? 1200 miles.

What's 1200-900=300 meters.

bdjuf where do you even address the time 30 seconds in your equation?

smack · 06-30-2003, 09:53 PM

i'm coming up with 900 meters and here's why, instead of using vector analysis i used D= 1/2*(A*T^2)
D is the distance you're looking for, a is the absolute value of your acceleration and T is the time (30 seconds)

it's the same formula you use to calculate how fast something will fall with gravity except you replace the A with the gravitational constant.

that makes any sense or am i just high?

smack · 06-30-2003, 09:53 PM

wow i was so fucking late on that.

Lane · 06-30-2003, 09:57 PM

omg, i knew this stuff at 9th or 10th grade or something..

how many of you are high school dropouts?

06-30-2003, 08:09 PM	#1
Luc Duboi So Fucking Banned Join Date: Mar 2003 Posts: 1,881	Math Problem!!!! A train is running at the speed 40 m/s , suddenly the driver pushes the brake and it reduces to -2 m/s^2 . Question : After 30 seconds, how far can that train go ?

06-30-2003, 08:12 PM	#3
RedShoe 赤い靴 call me 202-456-1111 Industry Role: Join Date: Feb 2001 Location: The Valley Posts: 14,831	about 100 miles. yeah, yeah definitely about 100 miles. __________________ SPECIALTY COSTUMES • PROPS • FX Superheroes • Monsters • Robots PM for details For any manufacturing needs. Adult or otherwise. aka BonsHigh on Insta Bonsai weed plants

06-30-2003, 08:16 PM	#7
Saintgames Registered User Join Date: Nov 2002 Posts: 43	damm metrics... how many MPH is that?? __________________ I be Kozmo *I"ll show you the stars*

06-30-2003, 08:18 PM	#9
Overscore Confirmed User Join Date: Aug 2002 Location: Keystone State Posts: 316	d=.5(a×t^2) d=.5(-2m/s^2×30s^2) The train will travel -900m. __________________ ¯Overscore¯ Last edited by Overscore; 06-30-2003 at 08:21 PM..

06-30-2003, 08:19 PM	#12
CDSmith Too lazy to set a custom title Industry Role: Join Date: May 2001 Location: My network is hosted at TECHIEMEDIA.net ...Wait, you meant where am I located at? Oh... okay, I'm in Winnipeg, Canada. Oops. :) Posts: 51,460	The liquor store is 12 km from my house, and it closes at 11 pm. If I drive at 70 km/h all the way there, buy a 66'er of vodka on sale for $38.95, then drive at 60km/h all the way back, can I feasibly be drunk by midnight? No using a calculator! __________________ *Promote Wildmatch, ImLive, Sexier.com, and more!!* ALWAYS THE HIGHEST PAYOUTS: Big Bux/ImLive SIGNUP ON NOW!!! Put some PUSSYCA$H in your pocket. ICQ me at: 31024634

06-30-2003, 08:11 PM	#2
buddyjuf Guest Posts: n/a	400meters because it would have stopped @ 20 seconds

06-30-2003, 08:14 PM	#4
Luc Duboi So Fucking Banned Join Date: Mar 2003 Posts: 1,881	scientific answer please. no guessing!!! 400 how ? 100 how ???

06-30-2003, 08:16 PM	#5
SpaceAce Confirmed User Join Date: Jul 2002 Location: Magrathea Posts: 6,493	I made this image a long time ago for another one of Luc's threads but I didn't get around to posting it. This is probably as close as I will ever get to having another chance, so here it is <IMG SRC="http://friends.porncherry.com/images/original/aznmath.gif"> SpaceAce

06-30-2003, 08:25 PM	#18
mjrools23 Confirmed User Join Date: Mar 2002 Location: NYC Posts: 1,604	need help with your HS math hw luc? __________________ http://www.pornstarxposed.com/

06-30-2003, 08:30 PM	#20
Thrawn$ Confirmed User Join Date: Apr 2002 Location: Mtl Posts: 4,596	800+ __________________ Tracking 202 \| Start Tracking PPC Campaigns Like A Pro

06-30-2003, 08:33 PM	#21
buddyjuf Guest Posts: n/a	here, I made a pic for you

06-30-2003, 08:42 PM	#32
buddyjuf Guest Posts: n/a	lol what does the lenght of that side represent? we are trying to find the surface, wich represents the position in meters, compared to the initial position, wich is 0

06-30-2003, 08:55 PM	#36
buddyjuf Guest Posts: n/a	its not the hypotenuse, its the "pente", as we say it in french.... whats the word for english, ARGH its Y/X, I dont know what the english word is for it the slope I guess? (I just checked a french english dictionnary)

06-30-2003, 08:58 PM	#38
buddyjuf Guest Posts: n/a	the graph is speed in the function of time the vertical bar represents the speed in m/s the horizontal bar represents the time in seconds the diagonal represents the slope, wich represents the acceleration (-2m/s^2) and the surface of the triangle represents the distance traveled

06-30-2003, 09:01 PM	#39
thekebie Confirmed User Join Date: Jun 2003 Location: The Hood of Burquitlam, BC Posts: 1,046	Physics that uses numbers and calculations is gay. True Physics is all theory.

06-30-2003, 09:05 PM	#40
buddyjuf Guest Posts: n/a	Mr.Wrong here you go http://www.physicsclassroom.com/Class/1DKin/U1L4e.html please read it carefully, it shows that the way I calculated is the correct way

06-30-2003, 09:15 PM	#41
the Shemp congrats to the winners Industry Role: Join Date: Nov 2001 Location: Echo Beach Posts: 10,891	__________________ i use Vacares...so should you Submit your picture galleries to my site...Outlaw TGP

06-30-2003, 09:18 PM	#43
mofo321 Registered User Join Date: Jun 2003 Posts: 14	actually it got negative decellaration so it should go backwards

06-30-2003, 09:31 PM	#45
cash69 So Fucking Banned Join Date: Oct 2002 Location: chandler, az Posts: 1,052	30 times farther then it was 30 seconds ago

06-30-2003, 09:39 PM	#46
Luc Duboi So Fucking Banned Join Date: Mar 2003 Posts: 1,881	I found interesting in BDJUF. BDJUF, you just got yourself rekon by your greatness. Mr. Wong. You're full of knowledge too!!!

06-30-2003, 09:53 PM	#48
smack Push Porn Like Weight. Industry Role: Join Date: Mar 2002 Location: Inside .NET Posts: 10,652	i'm coming up with 900 meters and here's why, instead of using vector analysis i used D= 1/2(AT^2) D is the distance you're looking for, a is the absolute value of your acceleration and T is the time (30 seconds) it's the same formula you use to calculate how fast something will fall with gravity except you replace the A with the gravitational constant. that makes any sense or am i just high? __________________ Cry havoc and let slip the dogs of war.

06-30-2003, 09:53 PM	#49
smack Push Porn Like Weight. Industry Role: Join Date: Mar 2002 Location: Inside .NET Posts: 10,652	wow i was so fucking late on that. __________________ Cry havoc and let slip the dogs of war.

06-30-2003, 09:57 PM	#50
Lane Will code for food... Join Date: Apr 2001 Location: Buckeye, AZ Posts: 8,496	omg, i knew this stuff at 9th or 10th grade or something.. how many of you are high school dropouts? __________________