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One last vector Problem


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#1 Aj37   Members   -  Reputation: 122

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Posted 07 October 2001 - 10:57 AM

The vector A is added to B=6i-8j. The resultant vector is in the positive x direction ans has a magnitude equal to A. What is the direction of A with respect to the +X direction? Answer 74 degrees I can''t see how to do this problem or how to start it.

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#2 Oluseyi   Staff Emeritus   -  Reputation: 1678

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Posted 07 October 2001 - 11:26 AM

Jesus! Buy a fucking textbook!

Do you understand the principle of vector resultants? If you have
A = ai + bj and
B = ci + dj, then
C = (A+B) = (a+c)i + (b+d)j
|A| = (a2 + b2)1/2
|B| = (c2 + d2)1/2

From this you should be able to deduce the magnitude of C. Now factor in the angle of C (74 degrees), which is equal to tan-1(y/x) where x and y are the i- and j-coefficients of the vectors.

EDIT: arctan.

Edited by - Oluseyi on October 7, 2001 6:27:09 PM

#3 Aj37   Members   -  Reputation: 122

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Posted 07 October 2001 - 11:52 AM

I apprecciate the help but not the attitude. I was told this was a forum to post physics related problems. I was also told that the experts are all professionals.

#4 Oluseyi   Staff Emeritus   -  Reputation: 1678

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Posted 07 October 2001 - 12:02 PM

Be that as it may, this is a high school math problem and that''s not what this forum is for. Furthermore, this is a math and physics forum on a game programming website.

#5 Aj37   Members   -  Reputation: 122

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Posted 07 October 2001 - 12:27 PM

This is a college physics problem and what does it matter if it was a high school math problem. I asked the people in charge of the forum if these questions were appropriate and that person said they were appropriate. I can''t understand why the questions are such a big issue for you that you have to use profanity and have such a attitude.

#6 Oluseyi   Staff Emeritus   -  Reputation: 1678

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Posted 07 October 2001 - 12:40 PM

I don''t mind the problem in and of itself. I do, however, mind three such problems in quick succession with no indication of attempt or effort. If you say you tried this method or the other, then I wouldn''t have any problem with it.

Netiquette demands that you show evidence of independent research before assaulting fora with questions. That''s why I have an attitude. No offense intended.

#7 Aj37   Members   -  Reputation: 122

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Posted 07 October 2001 - 12:52 PM

I tried all of these problems at least once. Try not to pass judgement on some one until you are aware of all the facts.

#8 Oluseyi   Staff Emeritus   -  Reputation: 1678

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Posted 07 October 2001 - 01:15 PM

Evidence not presented doesn''t count in a defence. And it''s such a basic problem (if it''s college physics then it''s intro physics) that I think it reflects poorly on you for needing to ask for the solution on GameDev . A search on Google will bring up several references on the subject matter, and a cursory glance through a math or physics textbook should answer all your questions.

#9 Aj37   Members   -  Reputation: 122

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Posted 07 October 2001 - 03:23 PM

I wasn''t aware I had to have a defense for asking a question. I was just asking a question and you decided to make a issue about it and use profanity. Then you pass judgement on me and call me a liar. Don''t answer my questions!!! My government the United States is currently dealing with people who think like you. Narrow minded and ignorant people are one of the bigest problems in the world today. You should work on that!!!!!!!!!!!!!!!

#10 Abominacion   Members   -  Reputation: 198

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Posted 08 October 2001 - 05:34 AM

quote:
Narrow minded and ignorant people are one of the bigest problems in the world today


You are the one showing ignorance here.

quote:
My government the United States is currently dealing with people who think like you.


Nice fascist statement for someone who isn''t narrow minded, isn''t it?
By the way, have you noticed that Oluseyi is also from the USA?


------------------------------------------------------
Cuando miras al abismo el abismo te devuelve la mirada.
F. Nietzsche

#11 CheeseGrater   Members   -  Reputation: 122

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Posted 08 October 2001 - 07:54 AM

quote:
Original post by Aj37
I apprecciate the help but not the attitude. I was told this was a forum to post physics related problems. I was also told that the experts are all professionals.


By and large they are. But they got that way by doing their /own/ homework. If you ever hope to understand this stuff, you should do the same.

Questions like these are the reason your school employs TA''s and holds office hours. You should probably utilize those resources first, since you''re /paying/ those people to help you.

On the flipside, don''t expect unfailingly perfect and flawlessly polite answers when you''re using a free service.

#12 Zipster   Crossbones+   -  Reputation: 675

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Posted 08 October 2001 - 09:32 AM

I''m sorry Aj37, but I have to agree with everyone else on this one. It appears to me, and I don''t even visit this forum that much, that you are just spitting your homework problems at us. I can understand if you don''t know how to do them, that''s OK, but at least try to get some help from your professor, buy a book on basic physics, visit a physics website, go to the library, etc., instead of immediatly coming here. This may be "the physics board", but it''s on a game programming site. I also seriously doubt this is the only physics related forum on the net.

#13 Burn6   Members   -  Reputation: 122

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Posted 08 October 2001 - 09:57 AM

I had Physics my junior year in high school. I am a senior now. I clearly remember doing those problems early on in the semester. Much fun.

If he''s having trouble with that, just wait until he hits Friction or Heat...the sheer size of the equations alone will baffle him.

#14 VolkerG   Members   -  Reputation: 151

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Posted 08 October 2001 - 10:01 AM

Aj37, why would you need an expert answering this question? Where I come from, students help each other. If one asks nicely he would find someone that would gave him a hint.
If you would really want to learn, you would have tried to solve the problem more than one time.
By the way, dou you want the members of this forum to solve all your homework? Currently I can see 5 homework questions you've posted.
I would try to learn how to solve problems yourself, or math/physics will always be a pain.

By the way, I'd like to know if this forum is meant for game related math/physics or if it is more general.

Edited by - VolkerG on October 8, 2001 5:07:41 PM

#15 grhodes_at_work   Moderators   -  Reputation: 1361

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Posted 08 October 2001 - 10:11 AM

quote:

Narrow minded and ignorant people are one of the bigest problems in the world today


quote:

You are the one showing ignorance here.



quote:
My government the United States is currently dealing with people who think like you.


quote:

Nice fascist statement for someone who isn't narrow minded, isn't it?
By the way, have you noticed that Oluseyi is also from the USA?



____________________________________________________

Lets not get too far out of hand with this folks.

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.

Edited by - grhodes_at_work on October 8, 2001 5:12:51 PM

Edited by - grhodes_at_work on October 8, 2001 5:20:08 PM

#16 grhodes_at_work   Moderators   -  Reputation: 1361

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Posted 08 October 2001 - 10:19 AM

I agree with VolkerG's statement. Students help each other, and interaction with other students is an important part of learning to complete tasks.

Its actually *critical* to work out problems with other students at one's school, rather than to consult with other folks who may be either professionals or more advanced students. By working with students roughly equivalent to yourself, you get the extra advantage of learning to work in teams without short-changing yourself in learning about problem-solving. Think about it.

Anyone wanting to participate in this forum should find a game development project to work on, and ask questions that are not related to school. It can be a hobby or personal growth project, or a professional pursuit. As long as you don't ask specifically for the answer to a homework problem, all's well.

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.

Edited by - grhodes_at_work on October 8, 2001 5:22:26 PM

#17 Aj37   Members   -  Reputation: 122

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Posted 08 October 2001 - 12:19 PM

Like I said before, I worked the problems at least once and asked a few questions. I didn''t expect to have people use profanity towards me for asking a question. Abominacion bustin heads only show''s ignorance if it is not warranted. Obviously you don''t have a clue about people as well as what goes on in the world or you would not of made that statement. I am not asking anyone to do my home work just a little help. This forum was reccommended to me by a programming guru and I guess this forum can''t handle the questions. I will ask my questions on another forum. I guess most of you people have spent most of your lives at home in front of a computer in some one horse town. Narrow minded people are the problem with the world today. I have been around the world at least once and I have fought in one war. Narrow minded, greedy, insecure, and ignorant, people are why we fight wars and why innocent people die.


Semper Fi

#18 Oluseyi   Staff Emeritus   -  Reputation: 1678

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Posted 08 October 2001 - 01:27 PM

Received in my mailbox a few minutes ago from Aj37:

----- Original Message -----
From: Drew J <awoo4us@yahoo.com>
To: Seyisonaiya@hotmail.com
Sent: Monday, October 08, 2001 8:09 PM
Subject: You are as narrow minded as they come.


You must be some kind of looser. Angry at the people
of the U.S.. You have a very american name?? and you
think like a racist. You ignorant Fuck head !!!!!! I
killed people like you in Iraq and I enjoyed every
minute of it. If the U.S. is to hard on you pussies
then get the fuck out!!!!!!!!!!!!!! Your a fuckin coward!!!!!!

__________________________________________________
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Just thought people might like to know.

EDIT: include email address.

Edited by - Oluseyi on October 8, 2001 8:30:49 PM

#19 Martee   Members   -  Reputation: 476

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Posted 08 October 2001 - 01:34 PM

WTF?
"I killed people like you in Iraq" ??



#20 VolkerG   Members   -  Reputation: 151

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Posted 09 October 2001 - 02:52 AM

Yea, he really knows how to make friends.




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