I want to know the explanation of this problem

In summary, the conversation discusses the calculation of pressure in a cylinderical jet of water with a diameter of 4mm and the surface tension of water being 0.0718 N/M. The formula used is ΔP= σ/r, with the answer being 0.0718/2*10^-3. The person questioning initially thought the formula should be ΔP= 2σ/r, but later understood the correct formula.
  • #1
Amr719
31
0

Homework Statement


By How much does the pressure in a cylinderical jet of water 4mm in diameter exceed the pressure of the surrounding atmosphere if the surface tension of water is 0.0718 N/M?

Homework Equations

The Attempt at a Solution


ΔP= σ/r=0.0718/2*10^-3 , This is the answer I have but I don't understand from where did he get this law . Isn't it supposed to be ΔP= 2σ/r instead ?[/B]
 
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  • #2
Amr719 said:

Homework Statement


By How much does the pressure in a cylinderical jet of water 4mm in diameter exceed the pressure of the surrounding atmosphere if the surface tension of water is 0.0718 N/M?

Homework Equations

The Attempt at a Solution


ΔP= σ/r=0.0718/2*10^-3 , This is the answer I have but I don't understand from where did he get this law . Isn't it supposed to be ΔP= 2σ/r instead ?[/B]
On what basis do you feel it should be ΔP= 2σ/r?

Chet
 
  • #3
Chestermiller said:
On what basis do you feel it should be ΔP= 2σ/r?

Chet
Sorry I was wrong , I understand it now
 

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The scientific method is a systematic approach used by scientists to investigate and solve problems. It involves making observations, formulating a hypothesis, designing and conducting experiments, analyzing data, and drawing conclusions based on evidence.

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Scientists use the scientific method to come up with explanations for problems. This involves making observations, conducting experiments, and analyzing data to test a hypothesis. If the results support the hypothesis, it is considered a possible explanation for the problem.

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Scientists ensure the accuracy of their explanations by using rigorous and well-designed experiments, collecting and analyzing data carefully, and conducting peer review to have their findings evaluated and critiqued by other experts in the field.

4. Can scientists ever have a definitive explanation for a problem?

While scientists can come up with explanations for problems based on current evidence, these explanations are always subject to change as new evidence and technology becomes available. Therefore, a definitive explanation for a problem may not be possible.

5. How can explanations from science be useful in solving real-world problems?

Explanations from science can be useful in solving real-world problems by providing evidence-based solutions and insights. By using the scientific method and constantly testing and refining explanations, scientists can provide practical solutions to a wide range of problems in fields such as medicine, engineering, and environmental science.

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