Re: Uncle Al's "Negative Energy"
- From: "Androcles" <Engineer@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 06 Feb 2007 08:51:27 GMT
"Keith P Walsh" <keith.p.walsh@xxxxxxxxxxxxxx> wrote in message news:7e1339cbebe5c6b66f37be79a7c0c880.37704@xxxxxxxxxxxxxxxxxxxxxx
"mmeron" <mmeron@xxxxxxxxxxxxxxxxxx> wrote in message
news:f%21d.64$25.3444@xxxxxxxxxxxxxxxxx
When I'm measuring displacements, along a line, I can characterize all
of them as "positive displacements" by adding the descriptors
"leftward" and rightward". This is needlessly complicated, though,
especially when we're getting to combining displacements. Much
simpler just to assign signs to them, picking one direction as
positive and the other as negative.
Mati Meron | "When you argue with a fool,
meron@xxxxxxxxxxxxxxxxx | chances are he is doing just the same"
Taking one apple out of a bowl of apples doesn't make it a "negative"
apple.
If you assign positive and negative signs to the processes of putting in
and taking out apples then what you have established is a convention for
identifying opposite processes.
But to call an apple which has just been taken out a "negative" apple
would be silly.
The mass/energy of all the apples is of the same sign (even if you
eat the one you've taken out).
Keith P Walsh
Energy is the ability to do work.
A bullet coming toward you can do work on you, killing you.
A bullet at rest has no energy to kill you.
The bullet had KE = 1/2 mv^2.
If you fly into a stationary bullet at 2000 mph, can
the bullet kill you?
How much energy does a bullet have if it is going away from you?
.
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