Re: New Poll

On Sat, 12 Sep 2009 16:30:35 -0700, Bob Casanova
<nospam@xxxxxxxx> wrote:

On Sat, 12 Sep 2009 00:09:16 +0100, the following appeared
in talk.origins, posted by martin <usenet@xxxxxxxxxxx>:

Bob Casanova wrote:
On Fri, 11 Sep 2009 10:29:51 -0700 (PDT), the following
appeared in talk.origins, posted by Woland
<jerrydeon@xxxxxxxxx>:

On Sep 11, 12:50 pm, spintronic <spintro...@xxxxxxxxxxx> wrote:
On Sep 11, 5:33 pm, odin <odinoo...@xxxxxxxxx> wrote:

any mass accellerated by an external energy, increases in mass/energy.
any mass accellerated by an internal energy, decreases in mass/energy.
So my car decreases in mass when I accelerate? Curious.

Yep. The *very* slight increase in relativistic mass is more
than offset by the decrease in fuel mass.

Electric motors

Hmmm... OK. Or he could be accelerating down a hill with no
power applied.

If the electric motors are powered by batteries, the batteries
are providing energy and their mass is accordingly decreased by
an amount equal to good ol' E = mc^2. It's still a decrease in
"fuel" mass.

But if one assumes that his car is equipped with a standard
internal combustion engine which is the source of the power
supplying the acceleration I stand by my comment.

It doesn't matter how the energy is supplied.

Since no such vehicle is 100% efficient, the decrease in fuel
relativistic mass will be greater than the increase in mass due
to kinetic energy. Of course, in most cars the fuel is decresing
because you're burning it up.

--
************* DAVE HATUNEN (hatunen@xxxxxxx) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *

.

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