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From: Mapsread on 1 Jul 2010 22:49
Hello all,

Suppose you have a metal cylinder that has a symmetrical hollow cavity
in the middle. You don't know the material composing the cylinder and
don't know it has a cavity. Supposing you had a fulcrum and a scale, I
thought you could place the fulcrum just under one edge of the hollow
cavity and place the far end on the scale and determine it was hollow.
You wouldn't know the location of the cavity so you'd have to perform
some trial and error, but I maintain the readings on the (very
sensitive) scale would belie the hollow. At the very least, moving the
fulcrum all along the cylinder and recording the forces on the scale
would indicate something was wrong. My friend disagrees. (We both
agree that when the fulcrum is all the way to either end or in the
exact center, no information will be revealed.)

Can anybody help us out?

TIA

P.S. By the way, we've both found other ways to reveal the hollow; the
simplest being spinning. I tend to think the fulcrum and scale would
work because of the exact same principles.
From: Sam Wormley on 1 Jul 2010 23:32
On 7/1/10 9:49 PM, Mapsread wrote:
> Hello all,
>
> Suppose you have a metal cylinder that has a symmetrical hollow cavity
> in the middle. You don't know the material composing the cylinder and
> don't know it has a cavity. Supposing you had a fulcrum and a scale, I
> thought you could place the fulcrum just under one edge of the hollow
> cavity and place the far end on the scale and determine it was hollow.
> You wouldn't know the location of the cavity so you'd have to perform
> some trial and error, but I maintain the readings on the (very
> sensitive) scale would belie the hollow. At the very least, moving the
> fulcrum all along the cylinder and recording the forces on the scale
> would indicate something was wrong. My friend disagrees. (We both
> agree that when the fulcrum is all the way to either end or in the
> exact center, no information will be revealed.)
>
> Can anybody help us out?
>
> TIA
>
> P.S. By the way, we've both found other ways to reveal the hollow; the
> simplest being spinning. I tend to think the fulcrum and scale would
> work because of the exact same principles.

Ultrasonic testing.


From: Androcles on 2 Jul 2010 01:44

"Mapsread" <cw_chw(a)yahoo.com> wrote in message
news:2e697573-962a-48f1-a8a0-2f7daef33c07(a)j4g2000yqh.googlegroups.com...
| Hello all,
|
| Suppose you have a metal cylinder that has a symmetrical hollow cavity
| in the middle. You don't know the material composing the cylinder and
| don't know it has a cavity. Supposing you had a fulcrum and a scale, I
| thought you could place the fulcrum just under one edge of the hollow
| cavity and place the far end on the scale and determine it was hollow.
| You wouldn't know the location of the cavity so you'd have to perform
| some trial and error, but I maintain the readings on the (very
| sensitive) scale would belie the hollow. At the very least, moving the
| fulcrum all along the cylinder and recording the forces on the scale
| would indicate something was wrong. My friend disagrees. (We both
| agree that when the fulcrum is all the way to either end or in the
| exact center, no information will be revealed.)
|
| Can anybody help us out?
|
| TIA
|
| P.S. By the way, we've both found other ways to reveal the hollow; the
| simplest being spinning. I tend to think the fulcrum and scale would
| work because of the exact same principles.
|
http://www.androcles01.pwp.blueyonder.co.uk/HollowCyl.jpg
Go on then, explain how you'd detect the cavity with fulcrum and scale
alone.


From: Mapsread on 2 Jul 2010 09:17
On Jul 2, 12:44 am, "Androcles" <Headmas...(a)Hogwarts.physics_z> wrote:
> "Mapsread" <cw_...(a)yahoo.com> wrote in message
>
> news:2e697573-962a-48f1-a8a0-2f7daef33c07(a)j4g2000yqh.googlegroups.com...
> | Hello all,
> |
> | Suppose you have a metal cylinder that has a symmetrical hollow cavity
> | in the middle. You don't know the material composing the cylinder and
> | don't know it has a cavity. Supposing you had a fulcrum and a scale, I
> | thought you could place the fulcrum just under one edge of the hollow
> | cavity and place the far end on the scale and determine it was hollow.
> | You wouldn't know the location of the cavity so you'd have to perform
> | some trial and error, but I maintain the readings on the (very
> | sensitive) scale would belie the hollow. At the very least, moving the
> | fulcrum all along the cylinder and recording the forces on the scale
> | would indicate something was wrong. My friend disagrees. (We both
> | agree that when the fulcrum is all the way to either end or in the
> | exact center, no information will be revealed.)
> |
> | Can anybody help us out?
> |
> | TIA
> |
> | P.S. By the way, we've both found other ways to reveal the hollow; the
> | simplest being spinning. I tend to think the fulcrum and scale would
> | work because of the exact same principles.
> |
>    http://www.androcles01.pwp.blueyonder.co.uk/HollowCyl.jpg
> Go on then, explain how you'd detect the cavity with fulcrum and scale
> alone.

Ha! That one defeats me. I was referring to a cavity that was shaped
like a cylinder smaller than the metal cylinder as a whole.
From: Androcles on 2 Jul 2010 09:35

"Mapsread" <cw_chw(a)yahoo.com> wrote in message
news:329ab76b-7fb4-4a1d-ac5d-b0ff93e90f1e(a)18g2000vbh.googlegroups.com...
On Jul 2, 12:44 am, "Androcles" <Headmas...(a)Hogwarts.physics_z> wrote:
> "Mapsread" <cw_...(a)yahoo.com> wrote in message
>
> news:2e697573-962a-48f1-a8a0-2f7daef33c07(a)j4g2000yqh.googlegroups.com...
> | Hello all,
> |
> | Suppose you have a metal cylinder that has a symmetrical hollow cavity
> | in the middle. You don't know the material composing the cylinder and
> | don't know it has a cavity. Supposing you had a fulcrum and a scale, I
> | thought you could place the fulcrum just under one edge of the hollow
> | cavity and place the far end on the scale and determine it was hollow.
> | You wouldn't know the location of the cavity so you'd have to perform
> | some trial and error, but I maintain the readings on the (very
> | sensitive) scale would belie the hollow. At the very least, moving the
> | fulcrum all along the cylinder and recording the forces on the scale
> | would indicate something was wrong. My friend disagrees. (We both
> | agree that when the fulcrum is all the way to either end or in the
> | exact center, no information will be revealed.)
> |
> | Can anybody help us out?
> |
> | TIA
> |
> | P.S. By the way, we've both found other ways to reveal the hollow; the
> | simplest being spinning. I tend to think the fulcrum and scale would
> | work because of the exact same principles.
> |
> http://www.androcles01.pwp.blueyonder.co.uk/HollowCyl.jpg
> Go on then, explain how you'd detect the cavity with fulcrum and scale
> alone.

Ha! That one defeats me. I was referring to a cavity that was shaped
like a cylinder smaller than the metal cylinder as a whole.
==========================================
In other words, a pipe with end caps, or a hollow coin. Go ahead,
explain how to distinguish it from a solid rod with end caps using
a fulcrum and scale alone.
http://www.pvcfittingsdirect.com/zoom_img/033.jpg
http://www.bolts-nuts-washers.com/images/tube_end_caps_short.jpg
This is very easy to put together, y'know.

How do you tell a boiled egg from a raw egg without cracking it?











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