Formula for Diameter of Cylinder Using Height/Volume.

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Discussion Overview

The discussion revolves around finding the formula for the diameter of a cylinder using its volume and height. Participants explore various approaches and formulations, including mathematical reasoning and clarifications regarding the relationship between diameter, radius, volume, and height.

Discussion Character

  • Mathematical reasoning
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant presents a formula for the diameter as D = Square Root of (4V/H/Pi) based on the volume formula for a cylinder.
  • Another participant confirms the formula D = \sqrt{ \frac{4V}{h\pi}} and suggests it is straightforward, but notes it could be expressed in terms of the radius.
  • A later post requests an explanation of the formula in terms of the radius, indicating difficulty with square roots.
  • Another participant attempts to derive the formula but initially expresses uncertainty about their approach, later refining their method to relate volume, height, and radius.
  • One participant provides the volume formula V = \pi r^2 h and derives the radius formula, leading to the diameter formula as d = 2\sqrt{\frac{V}{\pi h}}.

Areas of Agreement / Disagreement

Participants generally agree on the formula for the diameter but express varying levels of comfort with the mathematical operations involved. There is no consensus on the easiest method to derive or express the diameter in relation to the radius.

Contextual Notes

Some participants express uncertainty about their calculations and the clarity of their formulas. There are also indications of varying levels of mathematical proficiency among participants, which may affect their interpretations and applications of the formulas discussed.

Who May Find This Useful

This discussion may be useful for individuals seeking to understand the relationships between volume, height, and diameter in cylindrical geometry, particularly students or those working on related mathematical problems.

Jordin
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I need the formula for finding the Diameter of a Cylinder using it's Volume and Height.

Thanks!

Here is the problem. Find Diameter of Cylinder.
Volume = 1256.64
Height = 16 Inches
Diameter = ?

On my own...

Knowing Volume = (Pi x Diameter Squared x Height) Divide by 4

I came up with this formula for D?

D = Square Root of (4V/H/Pi)

Plugging in the numbers... D = 10 Inches?

Is there an easier formula?
 
Last edited:
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Well, what is the Cylinders volume is given by the product of the base circles area and its height. What is the circles area given by, in terms of the radius? How are the radius and diameter related?

PS: Welcome to Physics forums! =]
 
Well you that right, D= \sqrt{ \frac{4V}{h\pi}}. Easiest formula there is lol. Would look nicer in terms of the radius though.
 
I know this thread is old but it is the only one I could find that is most relevant to my problem.

Can you explain it in terms of the radius?

I am trying to figure out the same type of problem and am horrid with roots.
I need to find the diameter given H=10m and V=125.6m cubed
 
Here is the formula I used to figured it but I think it is wrong.
(I don't know how to do all the fancy stuff so I will just type it out.)

v/h over Pi=r squared

Edit: I think I got it figured now

New formula I am using is v/h*Pi= r squared
Find the square root of r squared then multiply * 2 for the diameter
 
Last edited:
The volume of a cylinder of height h and radius r is V= \pi r^2h.
To solve that for the radius, divide both sides by \pi h and take the square root:
r= \sqrt{\frac{V}{\pi h}[/itex]<br /> <br /> The diameter is twice the radius, of course, so <br /> d= 2\sqrt{\frac{V}{\pi h}= \sqrt{4V}{\pi h}[/itex] &lt;br /&gt; because \sqrt{4}= 2.
 

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