Science and Technology news... :: View topic

T Rex · Guest

Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.

Don Lancaster · Guest

T Rex wrote:
[quote]
Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.
[/quote]
See http://www.tinaja.com/glib/energfun.pdf

Energy is the capacity or capability to do work.
Work is accomplished when a force moves something through a distance.
Power is the time rate of doing work.

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com fax 847-574-1462

Please visit my GURU>s LAIR web site at http://www.tinaja.com

cyril · Guest

Retrouvons en direct tee.rex@lovemail.com (T Rex), notre envoyé(e)
spécial(e) sur sci.energy.hydrogen:

[quote]Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.
[/quote]
Energy can be descibed as a "money" used to "buy" and "sell" natural
processes.

This definition is totally personnal and non-scientific :-)

--
"Cette citation n>existe pas"
Beaumarchais, le coiffeur de Barcelone

Don Lancaster · Guest

cyril wrote:
[quote]
Retrouvons en direct tee.rex@lovemail.com (T Rex), notre envoyé(e)
spécial(e) sur sci.energy.hydrogen:

Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

Energy can be descibed as a "money" used to "buy" and "sell" natural
processes.

This definition is totally personnal and non-scientific :-)

--
"Cette citation n>existe pas"
Beaumarchais, le coiffeur de Barcelone
[/quote]
That would more correctly be "exergy".
Energy value is highly situational, depending upon its thermodynamic
reversibility fraction.

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com fax 847-574-1462

Please visit my GURU>s LAIR web site at http://www.tinaja.com

Dan Bloomquist · Guest

T Rex wrote:
[quote]Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.
[/quote]
It sometimes gets confusing because there are many forms of energy.

Energy is defined. It is Force times Length in mechanics. The water
behind a damn is a quantity of energy. Gravity creates the force by the
weight of the water. The length of the path is from the top of the water
to the bottom of the damn.

A Battery stores a quantity of energy. The equivalence to mechanics is
how much water you can lift some distance with the charge in the battery.

Mass is energy. E= mc^2. Don>t know if you want to go there.

Heat is energy. A gallon of water at room temperature has a quantity of
energy. (It>s a Joule thing.) ('Heat energy' is not the proper term,
'heat' is. 'Heat energy' is usually accepted to mean entropy, and that
is something else.)

Mechanical energy is the easiest to understand. What helps is to look
into the dimensional system. In mechanics, there is only length, mass
and time. (L,M,T) Energy is FL, F is force. Force is ML/T^2, (so it can
start to look complicated, but it really isn>t.)

Keep it in simple terms, like, you have 100 lb. of water that can fall
50 feet. the pounds represent the force and the 50 feet the length.

FL = 100 * 50, or 5000 foot-pounds., a measure of energy.

Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom

Dan Bloomquist · Guest

Don Lancaster wrote:
[quote]T Rex wrote:

Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.

See http://www.tinaja.com/glib/energfun.pdf

Energy is the capacity or capability to do work.
[/quote]
Energy and work are the same.

[quote]Work is accomplished when a force moves something through a distance.
[/quote]
Force times length is the definition of work, energy.

Heat is also a measure of energy.

Mass is also a measure of energy.

Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom

Don Lancaster · Guest

Dan Bloomquist wrote:
[quote]
Don Lancaster wrote:
T Rex wrote:

Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.

See http://www.tinaja.com/glib/energfun.pdf

Energy is the capacity or capability to do work.

Energy and work are the same.

Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom
[/quote]
Nope.
POTENTIAL energy has the capacity or capability to do work but has not
done so yet.

The work does not need to be actually performed so long as the
capability to do so is there.

Otherwise, there would be no energy in a battery.

See http://www.tinaja.com/glib/energfun.pdf

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com fax 847-574-1462

Please visit my GURU>s LAIR web site at http://www.tinaja.com

Dan Bloomquist · Guest

Don Lancaster wrote:
[quote]Dan Bloomquist wrote:

Don Lancaster wrote:

T Rex wrote:

Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.

See http://www.tinaja.com/glib/energfun.pdf

Energy is the capacity or capability to do work.

Energy and work are the same.

Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom

Nope.
POTENTIAL energy has the capacity or capability to do work but has not
done so yet.

[/quote]
Really. So work does not equal FL? Or is it a rock sitting on a hill
that does not equal FL? Or is the rock that is about to smash the bottom
of a canyon that doesn>t equal FL?

[quote]The work does not need to be actually performed so long as the
capability to do so is there.

[/quote]
So it is work that doesn>t equal FL or the 'capability' that doesn>t
equal FL?

[quote]Otherwise, there would be no energy in a battery.

[/quote]
??????? No equivalent FL in a battery?

[quote]See http://www.tinaja.com/glib/energfun.pdf

[/quote]
Errrr, I>ll pass. As far as I can tell, energy= FL, work= FL, therefor
energy = work. It is the work-energy theorem, not the work isn>t energy
theorem.

Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom

Don Lancaster · Guest

Dan Bloomquist wrote:
[quote]
Don Lancaster wrote:
Dan Bloomquist wrote:

Don Lancaster wrote:

T Rex wrote:

Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.

See http://www.tinaja.com/glib/energfun.pdf

Energy is the capacity or capability to do work.

Energy and work are the same.

Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom

Nope.
POTENTIAL energy has the capacity or capability to do work but has not
done so yet.

Really. So work does not equal FL? Or is it a rock sitting on a hill
that does not equal FL? Or is the rock that is about to smash the bottom
of a canyon that doesn>t equal FL?

The work does not need to be actually performed so long as the
capability to do so is there.

So it is work that doesn>t equal FL or the 'capability' that doesn>t
equal FL?

Otherwise, there would be no energy in a battery.

??????? No equivalent FL in a battery?

See http://www.tinaja.com/glib/energfun.pdf

Errrr, I>ll pass. As far as I can tell, energy= FL, work= FL, therefor
energy = work. It is the work-energy theorem, not the work isn>t energy
theorem.

Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom
[/quote]
Look up the definition of energy in ANY physics book.
The words CAPABILITY or CAPACITY invariably appear.
--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com fax 847-574-1462

Please visit my GURU>s LAIR web site at http://www.tinaja.com

Dan Bloomquist · Guest

Don Lancaster wrote:
[quote]
Look up the definition of energy in ANY physics book.
The words CAPABILITY or CAPACITY invariably appear.
[/quote]
Now you look at the origanal post, there was no question about work.

Then you posted:
"Energy is the capacity or capability to do work."

As if they were something different. Muddle.

If you want:
E= mv^2/2. They are the same. Accelerate a mass. Is that moving mass
work or energy? Was the accelleration a measure of work or energy?

When you are done, W = E = mv^2/2 = maL = FL.

Be Clear.
Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom

Dan Bloomquist · Guest

Don Lancaster wrote:
[quote]
Look up the definition of energy in ANY physics book.
The words CAPABILITY or CAPACITY invariably appear.
[/quote]
Now you look at the original post, there was no question about work.

Then you posted:
"Energy is the capacity or capability to do work."

As if they were something different. Muddle.

If you want:
E= mv^2/2. They are the same. Accelerate a mass. Is that moving mass
work or energy? Was the acceleration a measure of work or energy?

When you are done, W = E = mv^2/2 = maL = FL.

Be Clear.
Best, Dan.

--
http://lakeweb.net
http://ReserveAnalyst.com
dbAtLakewebDotCom

Jed Checketts · Guest

tee.rex@lovemail.com (T Rex) wrote in message news:<73269c91.0312231225.5ed9661b@posting.google.com>...

If it has the power to make something move it has energy.
I have energy.
Falling water contains energy.
The sun has energy to make the wind blow.
Steam has energy.
Red Bull gives you Energy. (or is it wings?)
Plants store energy from the sun.
Chemicals have energy which can react with other chemicals.
The earth has lots of energy, but not enough to propel any object on
earth back to where the earth was originally formed.
This is because our solar system is moving away from the center of the
universe so fast that no energy form on earth could ever be enough to
get back to the center of the universe. (or so they say). I>m not
_exactly_ sure I buy this.
As we speed on our earthly prison towards outer darkness, the edge of
the universe, or collision with some other object out there, it is
great to know that we circle our sun. It can keep supplying us with
energy for a long time as long as we continue to orbit the sun.
If the earth and the sun lose their mutual attraction for each other
and become divorced, it will get very cold on earth.
If we could convert the mass of earth into energy, it would keep
things going for a very very long time (at least at our current energy
usage level).
Some people say the Universe will slow its expansion and then collapse
back on itself. Others say it will just continue to drift apart
further and further forever.
Energy is never lost. Just converted into different forms.
Using energy obtained from the consumption of a bean burrito at Taco
Bell in order to come up with music is technically conforming to laws
of thermodynamics which state that energy is somehow winding down and
the whole universe will eventually reach a constant temperature of 4
Kelvin, or 5, whatever.
However, I think that the music will last forever. Somehow, it has the
power to make something move.
Just listen to a really good song and see if it doesn>t actually have
the power to make you move. If so, it contains energy in a way.
Art also contains energy. Throwing the "Mona Lisa" or "Scream" Or the
"Woman Standing in a field of wheat" (Van Gogh) on your barbecue grill
will return a set number of btu>s which Mr. Lancaster could probably
calculate to some degree of accuracy but something else actually will
be lost which took energy to produce and contains and stores energy in
ways which are hard for us to imagine.

Light energy can be converted into heat and motion.
Heat energy can be converted into motion.
Gravity is a form of energy and yet it isn>t. Sort of like a
permanent magnet. Sure, lots of kids _think_ they can build a motor
which runs only on magnets, but they only have the power to make
something move once. As soon as the metal spoon contacts the magnet,
movement stops. As soon as the apple falls to the ground because of
gravity, it stops.
So, I can>t tell you for sure if gravity is an energy source. I can>t
tell you for sure if a magnet contains energy either.
A lightning bolt has the power to make something move. But usually
just once, and it has energy.
And music, art, and sex have the power to move me. And if I had to
choose which force I would rather be moved by, I have to choose...

ps, The books of Dr. Seuss Contain energy. And not just in the fact
that paper burns to produce carbon dioxide and water.

Jed Checketts
West Covina, CA
626-581-7119

[quote]Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.[/quote]

Corey · Guest

Energy is the "state" of matter.

Ivar S. Ertesvåg · Guest

Don Lancaster wrote:
[quote]
T Rex wrote:

Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.
[/quote]
All attempts on giving a brief and general definition on energy can be
questioned.
If you are satisfied with classical mechanics, you get the definition
given by DL below. If you want to include thermal and chemical energy,
i.e. classical thermodynamics, you get a lengthy explaination.
If you want to includ relativity and nuclear energy, you may get a
simpler definition, though with little relevance for many everyday
phenomena.

[quote]
How do you respond when asked to define energy - by your
kid for example ?.

See http://www.tinaja.com/glib/energfun.pdf

Energy is the capacity or capability to do work.
[/quote]
What if this work is done against friction: Then you can not do
more work. Has the energy disappeared?
Thermal energy at environmental temperature can not do work. Is
it energy?
Actually, this looks more like the definition of exergy.

[quote]Work is accomplished when a force moves something through a distance.
Power is the time rate of doing work.
[/quote]

Ivar S. Ertesvåg

Jeff · Guest

"T Rex" <tee.rex@lovemail.com> wrote in message
news:73269c91.0312231225.5ed9661b@posting.google.com...
[quote]Looked thru the web.

Unable to find a good site that defines or explian energy.
Mayve I did not get to see the right sites.

One site says that Energy cannot be defined or described.

How do you respond when asked to define energy - by your
kid for example ?.
[/quote]
Easiest would be: Energy = the ability to do work.
Power is the rate at which the work is done.

Forms of non-mechanical work might be a PITA to describe simply.


www.GetXFactor.com Leading Technology, Science, Agriculture News and information	Part of the Identityscape.com network... getxfactor.com jmoodmusic.com smartbusinesschoices.com mintdepot.com lowfaresalways.com evangelicalview.com shoppingpodder.com soproudlywehail.com webnews.ws currenthumor.com

Science and Technology news... Forum Index -> Energy - Hydrogen Forum	Goto page 1, 2, 3, 4 Next
Page 1 of 4