How to solve for vectors components

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Homework Help Overview

The problem involves determining the displacement of a car that travels in multiple directions with specified speeds and distances. The context is vector components in a two-dimensional plane, with the positive x-axis directed east and the positive y-axis directed north.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to express the car's movements as vector components, considering the angles associated with each direction. There is uncertainty about the graphical representation of the vectors and how to accurately calculate the resultant displacement.

Discussion Status

Some participants have offered guidance on plotting the vectors and considering angles, while others express confusion about the correct representation of the movements. There is an ongoing exploration of how to sum the vectors and the implications of direction on the components.

Contextual Notes

Participants mention the need for clarity regarding the angles associated with the southwest direction and the potential for misinterpretation in plotting the vectors. There is also a note of uncertainty about the initial calculations of magnitudes and their representation in the vector diagram.

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Homework Statement


A car drives north at 48mi/h for 10 min and then turns east and goes 5.0 mi at 66mi/h . Finally, it goes southwest at 36mi/h for 6.0 min.

Determine the car's displacement.

Assume that the positive x and y axes are directed to the east and north, respectively.
Answers should be in x and y components of the resultant

Homework Equations


x component aka i hat lies in the x-axis
y component aka j hat lies in the y axis

The Attempt at a Solution


since the car is going north at that velocity. the magnitude of that vector is 8 mi. When the car goes east, the magnitude is given as 5.0mi. when the car moves southwest, the magnitude is 3.6mi.

Not sure if the graph is right but I thought I get feedback on it.

vector_zps56d5285d.png
 
Last edited:
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The total displacement is merely the sum of the given vectors. Write each vector in terms of its components. Note that a direction like southwest implies a 45 degree angle between south and west, this should help you write the components.

To find a vector component in a direction, you need to know the angle between the vector and that direction.
 
since the car is going north at that velocity. the magnitude of that vector is 8 mi. When the car goes east, the magnitude is given as 5.0mi. when the car moves southwest, the magnitude is 3.6mi.

correct...

so plot these on graph paper, tail to head [ector arrow point], and connect the final head to the origin...the length is your final magntiude and the angle you measure relative to horizontal records the orientation. ..so for example, go 8 up [vertical], from there 5 down and to the right at 45 degrees 5, then horizontal right from there 3.6...
 
I thought it was 5 horizontal right and 3.6 down left. Thanks for the feedback. i added a picture on what I did with the vector components. I feel super stuck on this problem.
 

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