In article , Jeff Wisnia wrote:

Jeeze, next you'll be asking if a shipping container with 200 canaries
in it weighs less if the birds are all flying around inside it than if
they're all standing on the floor.

Depends on whether the container is airtight or not, and, if airtight, if
there's enough air in it to keep the birds alive.

Try something a little more interesting like the kid's helium balloon on
a string floating inside a schoolbus. Which way does it move when the
bus driver brakes quickly, forwards or backwards, and why?

Inertia causes air to move forward, increasing the air pressure in the front
of the bus -- thus pushing the balloon backward.
Jeff


--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.