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PostPosted: Thu Jan 16, 2014 7:56 am 
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Koa
Koa
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Joined: Mon Sep 05, 2011 10:45 pm
Posts: 1484
First name: Trevor
Last Name: Gore
City: Sydney
Country: Australia
Focus: Build
Status: Professional
Joe Sallis wrote:
I'm still wondering if my equations were right?

If that's a serious question: No. The first was inverted.
For density you had volume/mass. Should be mass/volume. Referring back:
Trevor Gore wrote:
Joe,

Density is mass per unit volume (see above). Also best to work in metres, kgs and seconds. (SI units)

Your second equation is also inverted compared to convention which usually looks at a stiffness to density ratio which is stiffness (however you want to measure that) divided by density.

If you lived in the southern hemisphere it would all be a lot easier.

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Trevor Gore, Luthier. Australian hand made acoustic guitars, classical guitars; custom guitar design and build; guitar design instruction.

http://www.goreguitars.com.au


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PostPosted: Thu Jan 16, 2014 1:13 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Feb 20, 2008 7:15 pm
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First name: Ed
Last Name: Bond
City: Nanaimo
Country: Canada
Focus: Build
Status: Professional
What?

So equations written below the equator run counter clockwise too? No wonder they make no sense to me!


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PostPosted: Thu Jan 16, 2014 5:37 pm 
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Koa
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First name: Trevor
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meddlingfool wrote:
What?

So equations written below the equator run counter clockwise too?

No, just upside down.

Because the equations themselves are concepts rather than physical entities, they don't have mass, so they aren't subject to Coriolis effects.

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Trevor Gore, Luthier. Australian hand made acoustic guitars, classical guitars; custom guitar design and build; guitar design instruction.

http://www.goreguitars.com.au


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PostPosted: Mon Jan 20, 2014 7:48 am 
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Contributing Member
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Joined: Fri Oct 14, 2011 10:29 am
Posts: 502
First name: joseph
Last Name: sallis
City: newcastle-upon-tyne
State: tyne and wear
Zip/Postal Code: ne46xe
Country: UK
Focus: Build
Status: Amateur
Trevor Gore wrote:
Joe Sallis wrote:
I'm still wondering if my equations were right?

If that's a serious question: No. The first was inverted.
For density you had volume/mass. Should be mass/volume. Referring back:
Trevor Gore wrote:
Joe,

Density is mass per unit volume (see above). Also best to work in metres, kgs and seconds. (SI units)

Your second equation is also inverted compared to convention which usually looks at a stiffness to density ratio which is stiffness (however you want to measure that) divided by density.

If you lived in the southern hemisphere it would all be a lot easier.


It was indeed a serious question and thanks for answering it.
This is why examples are so useful.

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We are all in the gutter but some of us are looking at guitars.


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