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brinethery
 3 years ago
Anyone good with vector problems involving moments?
brinethery
 3 years ago
Anyone good with vector problems involving moments?

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brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Is my method correct or was I reading the problem wrong?

eashmore
 3 years ago
Best ResponseYou've already chosen the best response.0I don't understand what they mean by "equally inclined to the positive ends of the orthogonal axis," but your methodology looks correct and complete.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2You're totally wrong.... sorry

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Just kidding. Your method is correct and you get the right answer. Congratulations.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2@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 xaxis, with the yaxis and the zaxis. (Sorry if this info is nothing new to you!). A vector in 3space 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).

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I can give you harder problems if you want to practice.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Well it was just the wording. Sometimes I have to read the question a few times to figure out what he wants.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2To 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.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Yeah that equally inclined thing it's weird. Haha I bet you'll get a good grade.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2I 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?

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Well noboyd would notice them if they stay sit.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Or maybe they had to go to the bathroom =P

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2HAHAHAHAHA I have something funny to mention

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2I 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.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Ohh poor girl! Five hours is insane!

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2My instructor was really tough. The exams were all applicationbased and it had been 5 years since I'd been into math. My dad convinced me to sign up lol.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I wish you could help me with multivar calc. later

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I don't quite understand. In which grade are you?

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2I changed my mind about what field I want to go into.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2I took 3 quarters of calc starting when I was 17 and I'm 24 now.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Which grade am I in? "Starting over!"

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Sorry, but what were you studying before?

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2to get into pharmacy school

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Did you want to be a mathematiciand and then changed your mind?

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Nope, I am retarded at math compared to other people.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2and now what is your major? Engineering?

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I know you're not retarded but I can say is useful to think that haha.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2I think civil would be a good path. And hopefully I could get a job with county... anything having to do with infrastructure.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Ahh yeah! I remember you told me that long time ago!

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2If I had to build a house I would call you =P

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2It would crumble LOL!!!!!

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Hahaha "structurally unsound"

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I'm so used to that now.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Do you study there ATM?

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Please tell me when you get into statics. I have plenty of doubts on that!

eashmore
 3 years ago
Best ResponseYou've already chosen the best response.0Thanks 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 skyscrapers to drainage ditches! Keep up the great work! You're problems are always challenging and then you end up solving them before I can!

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2My 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 :)

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Was your problem wrong?

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2You 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.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2hahaha I know what a pdf is =P

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2The original problem was wrong. But then I uploaded the revision to Scribd. The link remains the same if it's a revision.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I meant what was the content of the pdf?

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2I 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.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2That is great! I wish I had teachers like him =P

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I had one but I failed miserably in his class. Shame on me.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Actually 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.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Thank you. I'd apreciated that!

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2k, I'll create a link.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2I want so bad to understand Maxwell's equations, but I suck at Calculus hehe

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Sucks, 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.

Nodata
 3 years ago
Best ResponseYou've already chosen the best response.2Maybe you're a different kind of learner.

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Sorry @eashmore we can bring the convo outside of here if you keep getting popup messages.

eashmore
 3 years ago
Best ResponseYou've already chosen the best response.0Doesn't bother me. The wealth of notifications strokes my ego a bit. :)

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.2Hahaha I'm totally abusing the system :). I'll try to bring it away from here.
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