Solving for V3: Finding the Velocity of Point Z3

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Homework Help Overview

The problem involves finding the velocity of a point in space, given the positions and velocities of two other points. The points are represented in a complex number format, and the discussion revolves around the relationships between these velocities and positions.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the equations provided and express confusion about how to relate the unknown velocity V3 to the known velocities V1 and V2. Some participants question the sufficiency of the given information, noting the lack of time or initial conditions necessary for a complete solution.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some have suggested that additional information may be necessary to solve for V3, while others are attempting to clarify the equations and their implications.

Contextual Notes

It is noted that the three points are on the same link, which may imply a geometric or physical constraint that could influence the relationships between their velocities.

PhysicsGenius
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Homework Statement


I am given the location of 3 points in space:
Z1= X_1+Y_1i
Z2= X_2+Y_2i
Z3= X_3+Y_3i

and the velocity of two points:
V_1= X_1+Y_1i
V_2= X_2+Y_2i

How do I find V3?

Homework Equations


V_1/2= V_1-V_2
V_3= V1+V_3/1
V_2/1= V_2-V_1

The Attempt at a Solution



I have the equations, but I just can't seem to figure out how to relate V_3 with V_2 and V_1. Can anyone help?
 
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Please help, I know it's something simple that I'm missing.
 
your name is a lie... lol

but seriously, if you could type it out a little more clearly i can help
 
Liquidxlax said:
your name is a lie... lol

but seriously, if you could type it out a little more clearly i can help
lol I know, I just wish I was a genius :frown:

What do you mean by more clearly? Let me put some numbers into the equations
I am given the location of 3 points in space:
Z1= 3+3i
Z2= 7+5i
Z3= 5+5i

V_1= 8+0i
V_2= 7+6i

How do I find V3?

Homework Equations


V_1/2= V_1-V_2
V_3= V1+V_3/1
V_2/1= V_2-V_1


Any help? Thanks.
 
i don't see how you can find velocity, with just position vectors and velocity. You have no time or initial position. Are you sure your putting everything in?

What textbook is this from?
 
Liquidxlax said:
i don't see how you can find velocity, with just position vectors and velocity. You have no time or initial position. Are you sure your putting everything in?

What textbook is this from?

Yes that is the entire problem, you are supposed to solve by using relative velocity. The equations I listed are a start, but I'm not sure where I go from there.
 
really, i don't think there's a way to solve this without something else given:frown:..
ideas anyone?
 
The problem also states that the 3 points are on the same link, if that helps.
 
Any ideas?
 
  • #10
no 1
 
  • #11
PhysicsGenius said:

Homework Statement


I am given the location of 3 points in space:
Z1= X_1+Y_1i
Z2= X_2+Y_2i
Z3= X_3+Y_3i

and the velocity of two points:
V_1= X_1+Y_1i
V_2= X_2+Y_2i

How do I find V3?

Homework Equations


V_1/2= V_1-V_2
V_3= V1+V_3/1
V_2/1= V_2-V_1

The Attempt at a Solution



I have the equations, but I just can't seem to figure out how to relate V_3 with V_2 and V_1. Can anyone help?

This is like saying:
There are 3 cars. Car A is traveling due East at 50 mph. Car B is traveling due north at 75 mph. What is the velocity of car C?

You don't have enough information to answer the question!
 

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