PF erased my problem anyways triangle problem

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Homework Help Overview

The discussion revolves around a triangle problem involving vector calculations and angle measurements. Participants are analyzing the relationships between the vectors and the angles formed at point Q, with specific attention to the accuracy of their calculations and the requirements of the assignment.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants are sharing their calculated vector lengths and angles, questioning the correctness of the angle at Q, and expressing frustration over the assignment's wording and requirements.

Discussion Status

There is an ongoing exploration of the angle measurements and vector lengths, with some participants suggesting that the provided values are acceptable while others express confusion over the instructions regarding exact values versus rounding. The discussion reflects a lack of consensus on the interpretation of the assignment's requirements.

Contextual Notes

Participants note potential ambiguities in the assignment's wording, particularly regarding the expectations for exact values and rounding, which may be contributing to their confusion and frustration.

flyingpig
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Homework Statement




[PLAIN]http://img832.imageshack.us/img832/5249/unledhbk.png



The Attempt at a Solution



Alright PF just erased all my work so here is my work without LaTex because I am too frustrated to do this all again

Basically I found the vectors

QP = <7,8,0>

|QP| = √113 ≈ 10.630

RP = <7,0,-5>

QR = <0,8,-5>

The others follow the same logic

I have dinner now so I will write out how I got the angles.
 
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I don't know why, but the angle at Q is right when I used those magnitudes...
 
flyingpig said:
I don't know why, but the angle at Q is right when I used those magnitudes...
I don't get this result for the angle at Q. Why do you think this is a right angle?
 
Mark44 said:
I don't get this result for the angle at Q. Why do you think this is a right angle?

Because it says it's right. No I am not talking "right angle - 90", I am was talking about "correct angle"

Damn you English language
 
Why? What do you get for angle Q?
 
SammyS said:
Why? What do you get for angle Q?

50.434 degrees as I have.

Mark44 said:
OK - what's your question?

My length for the vectors are wrong
 
They look fine to me. Those are the values (the lengths) that I got, and they asked you to round to 3 dec. places. Sometimes these computer-graded things are brain-dead.
 
It asks for the exact values.

I.e. √(113)
 
  • #10
Mark44 said:
They look fine to me. Those are the values (the lengths) that I got, and they asked you to round to 3 dec. places. Sometimes these computer-graded things are brain-dead.

Yeah I asked my professor about that and she has yet to respond...

I really hate lazy professors giving people online assignments
 
  • #11
SammyS said:
It asks for the exact values.

But it says to round to three decimal places

EDIT: OH CMON! WHAT?? THAT'S SO MISLEADING!
 
  • #12
The exact values for the lengths ... AND the angles rounded to 3 decimal paces.
 
  • #13
SammyS said:
The exact values for the lengths ... AND the angles rounded to 3 decimal paces.

yeah I know, exact values =/= rounding.

I hate these stupid online problems, they just catch on picky reading mistakes
 
  • #14
Why am I complaining to you?...sorry lOL
 
  • #15
There really should have been better punctuation in the question.
 
  • #16
SammyS said:
There really should have been better punctuation in the question.

Different clauses, it should be

"Find the exact values of the length ,and angle rounded to three decimal places"
 
  • #17
SammyS said:
There really should have been better punctuation in the question.
That caught me.
 

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