mat267_19527S19

Friday, January 25, 2019

10.4#5 (Edited)

I still have a question about number 5. It asks:
Find two unit vectors orthogonal to a=⟨−4,1,4⟩ and b=<5, -4, 3>

Enter your answer so that the first non-zero coordinate of the first vector is positive.
I attached my work below so you can see my thought process; however, I keep getting the k coordinates incorrect and I'm not sure where I'm going wrong.
Thank you for you time,

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It looks to me like you've done it correctly. BUT, if you click the "Email Instructor" button down at the bottom of the web page of your problem it will give me what you've done and what your numbers are so I can see exactly how and why it's misbehaving.

(Edit)
OK, you did that. Playing around with the webwork, it looks like all it wants is four decimal points instead of three.

Thursday, January 24, 2019

Lecture Notes through 1/28/19

Lecture Notes 1/11/19

Lecture Notes 1/14/19

Lecture Notes 1/18/19

Lecture Notes 1/23/19

Lecture Notes 1/25/19

Lecture Notes 1/28/19

Wednesday, January 16, 2019

Office Hours

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Tuesday, January 15, 2019

10.3 #14, first pass

Hello Tom!

I am having problems with finding what components of F are perpendicular and parallel to v. My initial answer was that the component -16j is perpendicular to v but the system is telling me I am wrong because "the first and second coordinates are wrong". I rephrased my answer to 0i-16j and to <0, 16> without success. I had similar issues with the parallel components; I started with the answer 0i and the system rejected it, as well as 0i-0j and <0, 0>, with the same message. Am I missing something or is the system being weird?

Thanks!
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OK, you're trying to do something, which experimenting, and that's is a good start. On the other hand you're trying anything you can think of, except maybe a strategy to figure out how to understand what you should do here.

Let me say, I see this a lot. Let me point out though, that your boss is expecting to pay you to figure out the answers to the problems she/he has, and is most definitely not expecting to pay to say "I don't know what to do". In fact you'll be expected to develop information sources on your own, and use them.

So my hint to you is this: Where do you think you could find the information you'll need to understand this problem? In fact here's another hint: what do you suppose those numbers up at the top of the problem could tell you about where to look?

Tell me what you come up with and get back to me, and we'll have another go-round on this.

Friday, January 11, 2019

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Monday, January 7, 2019

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