anonymous
  • anonymous
Anyone good with vector problems involving moments?
Engineering
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Is my method correct or was I reading the problem wrong?
anonymous
  • anonymous
http://www.scribd.com/doc/86313887/Problem-6
anonymous
  • anonymous
I don't understand what they mean by "equally inclined to the positive ends of the orthogonal axis," but your methodology looks correct and complete.

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anonymous
  • anonymous
You're totally wrong.... sorry
anonymous
  • anonymous
Just kidding. Your method is correct and you get the right answer. Congratulations.
anonymous
  • anonymous
@eashmore my instructor writes all of these problems and this was the practice final exam. I think he wanted to make the questions as hard as possible. He wanted us to work backwards (r crossed with F = moment, so find the components of F). Equally inclined means this: You have an angle with the x-axis, with the y-axis and the z-axis. (Sorry if this info is nothing new to you!). A vector in 3-space has those 3 direction angles: alpha, beta, and gamma. If all angles are equally inclined, you can say: alpha=beta=gamma = theta (we'll just use theta so as not to cause confusion). If you square the cosine of each angle, that will equal 1. cos^2(alpha) +cos^2(beta) +cos^2(gamma) = 1 Since the angles equal eachother (equally inclined with the positive axes, we can say: cos^2(theta) +cos^2(theta) +cos^2(theta) = 1 3 cos^2(theta) =1 cos^2(theta) = 1/3 cos (theta) = 1/sqrt(3) Therefore, all alpha, beta, and gamma have direction cosines of 1/sqrt(3) So after all of that work, your unit vector will be: (1/sqrt(3))i +(1/sqrt(3))j +(1/sqrt(3))k Pg. 29 seems to explain this concept fairly well (see attached).
1 Attachment
anonymous
  • anonymous
I can give you harder problems if you want to practice.
anonymous
  • anonymous
Well it was just the wording. Sometimes I have to read the question a few times to figure out what he wants.
anonymous
  • anonymous
To be fair, some other people were on here last night and had no clue what was going on. Well I finished my final today and I'm all "vectored" out.
anonymous
  • anonymous
Yeah that equally inclined thing it's weird. Haha I bet you'll get a good grade.
anonymous
  • anonymous
I will tell you what I don't get. The instructor gave 2 hours for the test. Some people finished in 50min, got up and left. Why not just sit around for the whole 2 hrs?
anonymous
  • anonymous
Well noboyd would notice them if they stay sit.
anonymous
  • anonymous
Or maybe they had to go to the bathroom =P
anonymous
  • anonymous
HAHAHAHAHA I have something funny to mention
anonymous
  • anonymous
I took multivar. calc last quarter and my teacher had us take the exams in the testing center. My classmate would sit in the testing center for like 5 hours taking her test. I asked her how she resisted going to the bathroom. She's like... I just hold it in.
anonymous
  • anonymous
Ohh poor girl! Five hours is insane!
anonymous
  • anonymous
My instructor was really tough. The exams were all application-based and it had been 5 years since I'd been into math. My dad convinced me to sign up lol.
anonymous
  • anonymous
I wish you could help me with multivar calc. later
anonymous
  • anonymous
I don't quite understand. In which grade are you?
anonymous
  • anonymous
I changed my mind about what field I want to go into.
anonymous
  • anonymous
I took 3 quarters of calc starting when I was 17 and I'm 24 now.
anonymous
  • anonymous
Which grade am I in? "Starting over!"
anonymous
  • anonymous
Sorry, but what were you studying before?
anonymous
  • anonymous
to get into pharmacy school
anonymous
  • anonymous
Did you want to be a mathematiciand and then changed your mind?
anonymous
  • anonymous
Nope, I am retarded at math compared to other people.
anonymous
  • anonymous
and now what is your major? Engineering?
anonymous
  • anonymous
I know you're not retarded but I can say is useful to think that haha.
anonymous
  • anonymous
I think civil would be a good path. And hopefully I could get a job with county... anything having to do with infrastructure.
anonymous
  • anonymous
Ahh yeah! I remember you told me that long time ago!
anonymous
  • anonymous
It's okay.
anonymous
  • anonymous
If I had to build a house I would call you =P
anonymous
  • anonymous
It would crumble LOL!!!!!
anonymous
  • anonymous
Hahaha "structurally unsound"
anonymous
  • anonymous
I'm so used to that now.
anonymous
  • anonymous
Do you study there ATM?
anonymous
  • anonymous
Please tell me when you get into statics. I have plenty of doubts on that!
anonymous
  • anonymous
I'll brb... sec
anonymous
  • anonymous
Thanks for the explaination of 'equally inclined.' @brinethery I've never heard that expression. Civil is a great field if you're interested in infrastructure. Everything from sky-scrapers to drainage ditches! Keep up the great work! You're problems are always challenging and then you end up solving them before I can!
anonymous
  • anonymous
My teacher responded to my email this morning after I sent him the pdf file of what I wrote. He's like... no, no! Here's how you do it! Again, Jae saves the day :-)
anonymous
  • anonymous
what pdf?
anonymous
  • anonymous
Who is Jae?
anonymous
  • anonymous
My instructor.
anonymous
  • anonymous
Was your problem wrong?
anonymous
  • anonymous
You know the program Adobe that opens up those document files where you can only view them and do a tiny bit of editing? That's a pdf file.
anonymous
  • anonymous
hahaha I know what a pdf is =P
anonymous
  • anonymous
The original problem was wrong. But then I uploaded the revision to Scribd. The link remains the same if it's a revision.
anonymous
  • anonymous
I meant what was the content of the pdf?
anonymous
  • anonymous
ahhh!
anonymous
  • anonymous
I think I trashed the original, but it's wrong lol. But the current version is correct. I thought he was saying that F sub x and F sub y were equally inclined. But he corrected me on that.
anonymous
  • anonymous
That is great! I wish I had teachers like him =P
anonymous
  • anonymous
I had one but I failed miserably in his class. Shame on me.
anonymous
  • anonymous
Actually he's teaching engr 106, but another instructor writes all of the exams and final exam. So that's probably why the exams are worded so strangely.
anonymous
  • anonymous
Thank you. I'd apreciated that!
anonymous
  • anonymous
k, I'll create a link.
anonymous
  • anonymous
I want so bad to understand Maxwell's equations, but I suck at Calculus hehe
anonymous
  • anonymous
Perfecto!
anonymous
  • anonymous
Sucks, I wish I had all the solns for at least one textbook. I don't think of it as cheating if I'm reading solutions as though I would read a textbook. It just helps to better understand things.
anonymous
  • anonymous
Maybe you're a different kind of learner.
anonymous
  • anonymous
Sorry @eashmore we can bring the convo outside of here if you keep getting pop-up messages.
anonymous
  • anonymous
Doesn't bother me. The wealth of notifications strokes my ego a bit. :-)
anonymous
  • anonymous
Hahaha I'm totally abusing the system :-). I'll try to bring it away from here.

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