Why do we need to raise the whole pi_3 to power of -1/2?

In summary, the conversation discusses the need to raise the whole pi_3 to the power of -1/2 and the implications of doing so. The main concept being explained is finding dimensionless terms using pi_3 and the flexibility in representing these terms.
  • #1
hotjohn
71
1

Homework Statement


in the third photo attached , why do we need to raise the whole pi _3 to power of -1/2 ?
can we do so ? if we do so , the original pi_3 will be changed , right ?

Homework Equations

The Attempt at a Solution

 

Attachments

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  • #2
That's impossible to read and maybe a little long. Could you type in a more condensed question in latex?
 
  • #3
I can't read the attachments either, much too fuzzy.
But maybe I can answer the question. The basic idea is to find dimensionless terms (the 'pi' terms) formed by raising the parameters to various powers and multiplying them together. There is 1 degree if freedom in each such term. E.g. If you came up with m1l1F-1t-2, you could equally write it as m2l2F-2t-4. That combines the same parameters in the same ratios, so is still dimensionless, and represents the same mixture.
Does that explain it?
 
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Related to Why do we need to raise the whole pi_3 to power of -1/2?

What is the Buckingham pi theorem 2?

The Buckingham pi theorem 2, also known as the Buckingham Pi Theorem for Dimensional Analysis, is a mathematical theorem used in dimensional analysis to determine the number of independent variables in a formula. It states that if there are n variables involved in a formula and these variables have m fundamental dimensions, then the formula can be reduced to p = n - m independent non-dimensional parameters.

Why is the Buckingham pi theorem 2 important in science?

The Buckingham pi theorem 2 is important in science because it allows scientists to simplify complex formulas and reduce the number of variables needed to describe a system. This makes it easier to understand and analyze physical systems, and it can also help to identify relationships between different physical quantities.

How is the Buckingham pi theorem 2 used in experiments?

In experiments, the Buckingham pi theorem 2 is used to determine which variables are relevant and which can be ignored. By reducing the number of variables, scientists can design experiments that are more efficient and cost-effective. It also helps to identify the most important factors that affect the outcome of the experiment.

What are the limitations of the Buckingham pi theorem 2?

One limitation of the Buckingham pi theorem 2 is that it only applies to physical systems that can be described using mathematical equations. It also assumes that the variables involved in the formula are all independent, which may not always be the case in complex systems. Additionally, it does not take into account any non-linear relationships between variables.

Can the Buckingham pi theorem 2 be applied to any physical system?

The Buckingham pi theorem 2 can be applied to many physical systems, including but not limited to fluid mechanics, heat transfer, and electromagnetism. However, there may be certain systems that do not follow the assumptions of the theorem and therefore cannot be analyzed using this method.

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