In article ,
"00:00:00Hg" wrote:

On Fri, 03 Mar 2006 08:00:45 -0800, fredfighter wrote:


Jose wrote:
Suppose we have a 1500 lb airplane in level flight at 120 mph.
What are its horizontal and vertical components of momentum?

Zero at equalibrium.

Incorrect. It has considerable horizontal momentum and no vertical
momentum.



Suppose we have a 1500 lb rocketship hovering over the moon on its
rocket exhaust. What are its horizontal and vertical componnts of
momentum?

Again, zero.

Correct, but how can you possibly get zero for this answer and think
that an aircraft moving horizontally at 120 mph has no horizontal
momentum...

snip

--
Alan Baker
Vancouver, British Columbia
"If you raise the ceiling 4 feet, move the fireplace from that wall
to that wall, you'll still only get the full stereophonic effect
if you sit in the bottom of that cupboard."