Vector Addition: Solving for Magnitude of B in C+B=7i+5j

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Homework Help Overview

The discussion revolves around a vector addition problem involving two vectors, B and C, where C is defined as 7i + 5j. The original poster expresses confusion regarding the wording of the problem and how to set it up for solving. The task is to determine the magnitude of vector B based on its relationship with vector C and the resultant vector.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants explore the relationship between vectors B and C, questioning how to express B in terms of its components. There is discussion about the magnitude of vector C and how it relates to the components of vector B. Some participants suggest that the y-component of B must be determined to satisfy the conditions of the problem.

Discussion Status

The discussion is ongoing, with participants providing insights and questioning the assumptions regarding which vector should have the same magnitude as C. There are various interpretations of the problem setup, and some guidance is offered regarding the components of vector B.

Contextual Notes

Participants note potential confusion in the problem wording and the need for clarity on which vector's magnitude is to be compared with that of vector C. There is also mention of the resultant vector's properties and how they relate to the components of B.

jaciel2001cas
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I got a problem on a homework but the wording is kind of confusing and i don't know how to place it down on paper in a way that i can solve it...thanks for all the help..it looks basic, I find the Problem in weather its B+C=7i+5j or B+C=C being b+(7i+5j)=C

1: A vector, B, when added to the vector C=7i+5j yields a resultant vector which is in the positive y direction and has a magnitude equal to that of C. what is the magnitude of B?
 
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You know for sure that B = -7i + yj, how do you suppose you find what y should be? What is the magnitude of C? Do the two vectors look similar at all?
 
So magnitude of (B + C) = sqrt(7^2+5^2)
and the y component in A when added to C's y component has to be greater than 0.
 
im gettin 7.9 on the value of B..is that correct?
thanks for your help
 
Oh, which vector is supposed to have the same magnitude as C? If vector B is supposed to have the same magnitude then it should be B = -5i + (what)j, but if the resultant vector, call it D, is supposed to have the same magnitude then you need B = -5i + (you find it)j. Your answer would not be right for either case.
 

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