How Do You Calculate Vector Addition and Subtraction?

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SUMMARY

This discussion focuses on calculating vector addition and subtraction for two vectors: vector a with a magnitude of 4.3 m directed east and vector b with a magnitude of 3.9 m directed 35° west of north. The key equations referenced include the Pythagorean theorem for magnitude calculation and trigonometric functions for determining direction. Participants emphasize the importance of visual representation through diagrams to aid in understanding vector relationships and calculations.

PREREQUISITES
  • Understanding of vector magnitude and direction
  • Familiarity with trigonometric functions, specifically sine and cosine
  • Knowledge of the Pythagorean theorem
  • Ability to interpret and create vector diagrams
NEXT STEPS
  • Learn how to apply the Law of Cosines for vector addition
  • Study the process of converting between polar and rectangular coordinates
  • Explore vector decomposition into components
  • Practice problems involving vector addition and subtraction using different angles
USEFUL FOR

Students studying physics or mathematics, particularly those focusing on vector analysis and problem-solving techniques in mechanics.

mikeyp
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Homework Statement




Vector a has a magnitude of 4.3 m and is directed east. Vector b has a magnitude of 3.9 m and is directed 35° west of north. What are (a) the magnitude and (b) the direction (from east) of a + b ? What are (c) the magnitude and (d) the direction (from east) of b - a? Round your angles to the nearest degree.


Homework Equations


socahtoa? a^2+b^2=c^2
sin(35)*3.9/4.3


The Attempt at a Solution


sin(35)*3.9/4.3
 
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mikeyp said:

Homework Statement




Vector a has a magnitude of 4.3 m and is directed east. Vector b has a magnitude of 3.9 m and is directed 35° west of north. What are (a) the magnitude and (b) the direction (from east) of a + b ? What are (c) the magnitude and (d) the direction (from east) of b - a? Round your angles to the nearest degree.


Homework Equations


socahtoa? a^2+b^2=c^2
sin(35)*3.9/4.3


The Attempt at a Solution


sin(35)*3.9/4.3

Welcome to the PF,

On vector questions like this, it is helpful to draw a diagram showing the vectors and their addition/subtraction. Can you draw the diagrams and scan/upload them?
 

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