Finding a Vector in Cartesian form

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SUMMARY

The discussion revolves around converting a vector u→ into Cartesian form, given its magnitude of 8 and a direction of 75° in standard position. The correct Cartesian coordinates can be calculated using the formulas x = r * cos(θ) and y = r * sin(θ), where r is the magnitude and θ is the angle. For this vector, the coordinates are approximately (2.1, 7.7) after rounding to one decimal place. The conversation highlights the importance of verifying mathematical solutions with reliable sources.

PREREQUISITES
  • Understanding of vector representation in Cartesian coordinates
  • Knowledge of trigonometric functions: sine and cosine
  • Familiarity with standard position angles in mathematics
  • Basic skills in rounding numerical values
NEXT STEPS
  • Study the process of converting polar coordinates to Cartesian coordinates
  • Learn about vector operations in two-dimensional space
  • Explore trigonometric identities and their applications in vector calculations
  • Practice problems involving vector magnitude and direction
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Students studying mathematics, particularly those focusing on vectors and trigonometry, as well as educators seeking to clarify vector conversion methods.

Physics345
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Homework Statement


Find u→ in Cartesian form if u→ is a vector in the first quadrant, ∣u→∣=8 and the direction of u→ is 75° in standard position. Round each of the coordinates to one decimal place.

Homework Equations


none

The Attempt at a Solution


I'm certain this is correct, but some guy at the library told me it was wrong, can someone please confirm if it is wrong for me.
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Physics345 said:
but some guy at the library told me it was wrong
Now you can say that some guy on the internet said it was right.

If the guy in the library didn't tell you why it was wrong, he wasn't of much help...
 
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DrClaude said:
Now you can say that some guy on the internet said it was right.

If the guy ion the library didn't tell you why it was wrong, he wasn't of much help...

He had an explanation I just couldn't understand it, I guess he just wanted to talk. I assumed he was correct since he was an older man he wouldn't bother making it up. I guess I should have known a most of the people in that library are either homeless or on drugs, no wondering it's being shut down. Anyways I thought I would double check and make sure I'm not missing something by asking the knowledgeable and wonderful people on here! Better safe than sorry. Thanks a lot Dr. Claude.
 

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