Comparing ωxr and rxω in Vector Calculations

In summary, the order in which you perform vector cross product calculations can affect the direction of the resultant vector. This is because the cross product is a mathematical operation that is order dependent. The convention is to use ωxr when the vectors are specified in a right-handed coordinate system and to use rxω when a physical law is involved.
  • #1
Icetray
84
0
Hi guys,

I just wanted to know when to use ωxr and when to use rxω when we're making vector based calculations. I realized that when reversed te calculations tend to differ a lot.

Thanks for the help in advance!
 
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  • #2
[tex]AxB = -BxA[/tex]

It's strictly convention. The magnitude of the vector you get will be the same either way, however, it will be in the opposite direction. You need to think about the problem asked to figure out which way you should perform the cross product.
 
  • #3
Icetray said:
Hi guys,

I just wanted to know when to use ωxr and when to use rxω when we're making vector based calculations. I realized that when reversed te calculations tend to differ a lot.

Thanks for the help in advance!

They result in a different direction for the resultant (diametrically opposite direction, actually). The cross product is a mathematical operation that is order dependent.

There is no way to answer your question without knowing the context; If a physical "law" is involved then the order is specified to result in the correct direction given that the vectors involved are specified in a standard "right handed" coordinate system.
 

1. What is the difference between ωxr and rxω in vector calculations?

ωxr and rxω are two different ways of calculating the cross product of two vectors. ωxr is the traditional way, where the cross product is calculated by taking the magnitude of the first vector, multiplying it by the magnitude of the second vector, and then multiplying by the sine of the angle between the two vectors. rxω, on the other hand, is a newer method that uses the magnitude of the cross product of the two vectors and the magnitude of the second vector to calculate the cross product.

2. Which method is more accurate, ωxr or rxω?

Both methods are equally accurate in calculating the cross product of two vectors. However, rxω is often preferred because it is simpler and easier to use in calculations.

3. Can ωxr and rxω be used interchangeably in vector calculations?

Yes, ωxr and rxω can be used interchangeably in vector calculations. However, it is important to note that the resulting values may differ slightly due to rounding errors or differences in precision.

4. Are there any advantages of using ωxr over rxω or vice versa?

One advantage of using rxω over ωxr is that it is simpler and easier to use in calculations. Additionally, rxω does not require the calculation of the sine of the angle between the two vectors, which can be time-consuming. However, some may argue that ωxr is a more traditional and widely-used method, and therefore may be more familiar to some scientists.

5. In what situations would you recommend using ωxr over rxω or vice versa?

It ultimately depends on personal preference and the specific calculation being performed. If simplicity and speed are important factors, then rxω may be the preferred method. However, if traditional methods are preferred or if the calculation involves more complex vectors, then ωxr may be a better choice.

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