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# Mass, energy, work & power

## Mass, energy, work & power - Physics Forum

### Mass, energy, work & power - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
08-18-2003, 11:37 AM
 Donald G. Shead Guest Posts: n/a
Mass, energy, work & power

We could use hot rocks as an energy source to heat our homes; but there are
better ways:

One of those better ways is oil. Its shipping and handling is relatively
safe and easy. There are also gas and electricity which can be piped and
wired in.

The production of heat energy can be achieved in many ways; chiefly by
direct combustion of combustible material; but also by friction and
compression: The heat energy of repeated compression cycles of air for
example requires lots of "impulses" in order to produce heat in quantity:
These impulses can be short, long, and even continuous; but require an
energy source:

The heat energy produced by human thrusts is paltry compared to that of a
continuous flame in a furnace, and/or an internal or external combustion
engine.

One beauty of engines is that they can do a lot of work before they wear
out, and it is the evolution of such engines that has been a major factor in
improving our standard of living.

In physics we are not only concerned with molecular heat, but we are also
interested in molar motion; our own as well as that of the materials that we
need to move to make our lives easier.

I've determined that molar motion is most economically achieved by using as
much thrust as can be mustered; for as little time as practical. The longer
an effort is maintained, the greater is the energy consumption.

Doing work requires a _net force_ [f] greater than the friction,
gravitational, or other resisting force. If we haven't the power to exert a
force greater than the resistance, we waste a lot of energy without
accomplishing anything.

The equation m = ft²/s = 2w/g can be applied: Where the impulse [ft] is the
measure of the energy consumed:

#2
08-18-2003, 12:30 PM
 Ronald Stepp Guest Posts: n/a
Mass, energy, work & power

"Donald G. Shead" <[Only registered users see links. ]> wrote in message
news:ST20b.26678\$[Only registered users see links. ].prodi gy.com...
there are

Really, and what heats the rocks?

#3
08-18-2003, 06:46 PM
 Paul Cardinale Guest Posts: n/a
Mass, energy, work & power

Has is occurred to you that the reason that everyone knows that you're
an imbecile is because you blather relentlessly on things about which
you know nothing? If your goal is to become well known as a
vociferous moron, you can stop now; you accomplished it long ago.

Paul Cardinale
#4
08-18-2003, 07:36 PM
 Donald G. Shead Guest Posts: n/a
Mass, energy, work & power

"Paul Cardinale" <[Only registered users see links. ]> wrote in message
Cut<
If your goal is to become well known as a

The opinion of Paul Cardinale is worth 2 cents; if that!

#5
08-18-2003, 09:48 PM
 Double-A Guest Posts: n/a
Mass, energy, work & power

"Donald G. Shead" <[Only registered users see links. ]> wrote in message news:<ST20b.26678\$[Only registered users see links. ].prod igy.com>...
[snip]

Speaking of thrusts, I once watched this Italian movie late at night
on a movie channel, and in its futuristic scenario, Italy had
completely run out of energy resources. Then a brilliant scientist
came up with the idea of a device to capture the energy of all that
country's sexual activities! The devices were installed in mattresses
and any other place where an orgasm might occur. Before I dozed off,
I remember that they had the whole city of Rome once again
electrified!

Just an idea!

Double-A
#6
08-19-2003, 06:11 AM
 Chip Guest Posts: n/a
Mass, energy, work & power

"Donald G. Shead" <[Only registered users see links. ]> wrote in message
news:tV90b.26750\$[Only registered users see links. ].prodi gy.com...

No, Paul is 100% correct: You are a complete idiot.

#7
08-19-2003, 08:00 AM
 The Ghost In The Machine Guest Posts: n/a
Mass, energy, work & power

In sci.physics, Uncle Al
<[Only registered users see links. ].net>
wrote
on Mon, 18 Aug 2003 07:35:36 -0700
<[Only registered users see links. ].net>:

Only that a perfect Carnot heat pump is more efficient, in theory.
I don't know how close a fridge comes thereto, though. :-)

As for the rocks -- they're hard to transport; a better
heat transference mechanism would probably be water,
ammonia, or mercury. I'd have to look, frankly.

--
#191, [Only registered users see links. ]
It's still legal to go .sigless.
#8
08-19-2003, 02:02 PM
 Paul Cardinale Guest Posts: n/a
Mass, energy, work & power

"Donald G. Shead" <[Only registered users see links. ]> wrote in message news:<tV90b.26750\$[Only registered users see links. ].prod igy.com>...

Which makes it at least two orders of magnitude more valueable than
anything you post.

Paul Cardinale

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