Threads Changing to more appropriate groups
Sorry Greg missed the stop sign.
I think the boatdesign transfer idea is a goodone and we should do it where
appropriate.
One method could be to put up both groups on a message as a sort of turn
signal
Jeff G..
I think the boatdesign transfer idea is a goodone and we should do it where
appropriate.
One method could be to put up both groups on a message as a sort of turn
signal
Jeff G..
----- Original Message -----
From: GHC <ghartc@...>
To: <bolger@egroups.com>
Sent: Tuesday, November 07, 2000 8:28 AM
Subject: DEAD THREAD, THE END: [bolger] Re: Physics (and Water Ballast)
Ok, let's call this a dead thread.
Gregg Carlson
moderator
At 11:10 PM 11/6/2000 +0200, you wrote:
>On Mon, 6 Nov 2000, Brand, Christopher wrote:
>
>> Example of water ballast "working" below the surface of the water: Take
a
>> hollow lead sphere that is just more than neutrally bouyant. It floats
just
>> awash. This lead sphere has a watertight bulkhead that cuts it in half
and
>> one hemisphere has a valve that can allow water to enter. If that
>> hemisphere is allowed to flood with water, the sphere will sink and it
will
>> orient itself with the flooded half at the bottom (toward the center of
the
>> earth). If the sphere is turned so that the flooded half is at the top,
it
>> will right itself powerfully.
>>
>> This behavior is in spite of the fact that all the water ballast is below
>> the "waterline". The reason is the separation of the center of gravity
and
>> the center of bouyancy. CG is located in the lower hemisphere, the CB is
>> located in the center of the dividing bulkhead disk. These must (by
vitrue
>> of the forces acting upon them) vertically align themselves.
>
>First, the empty half's mass is less than the flooded half's. Second,
>its buoyancy is positive, whereas that of the flooded half is zero.
>No wonder the empty half comes up on top; it has both gravity and
>buoyancy on its side.
>
>But I don't think I have said that a boat ballasted with water will
>float bottom-up...:-)
>
>
>Sakari Aaltonen
>
>
>
>
>Bolger rules!!!
>- no cursing
>- stay on topic
>- use punctuation
>- add your comments at the TOP and SIGN your posts
>- add some content: send "thanks!" and "ditto!" posts off-list.
>
>
Bolger rules!!!
- no cursing
- stay on topic
- use punctuation
- add your comments at the TOP and SIGN your posts
- add some content: send "thanks!" and "ditto!" posts off-list.