Dose Energy Weigh????

[snailin91]

me and a pal at work were talkin about this the other day. in my line of work, we use "cordless drill guns". anyhow. i swear that after a charge, my pack weighs more. but neither of us have a "triple beam scale" to weigh a dead pack and a charged pack. so my question is, dose energy retain weight? if so, how much would a volt or amp weight be?

[minoreparations]

isn't a regular AA battery lighter when it's dead? so i'd say it is lighter.

[KillerCam282]

ok, weight is simply the earth's gravitational pull on whatever it is we're weighing.....gravity doesn't affect energy, so no, energy is weightless, but if you factor in things like batteries, then maybe moisture has a role in it all...honestly, i work with battery guns every day, and i've never thought they weighed less when dead vs. charged.......

sunlight is pure energy, and has NO weight at all........

Not sure . Sound travel is better in a dark area as opposed to lit area. Energy must have some kind of weight. Minimal tho.

[KillerCam282]

so you're saying sunlight weighs something?

from what studies have shown, the earth's gravitational pull has NO effect on sunlight at all........if it did, it would draw light to it, but that's not the case......even though sunlight has momentum, it weighs nothing.....what you have to keep in mind is that weight is basically how hard the earth is pulling you down to it........you don't weigh on mt. everest what you do in death valley.....so technically, if you get far enough away from everything, you'll weigh NOTHING, regardless of mass.......

your example could easily have to do with heat.......where there is light, there is heat.....even artificial light produces heat........

Now you got me thinking...See, if light can affect sound travel. Light must have some kind of mass, even if its minimal. Sounds is caused by vibrations that affect the flow of air correct? Therefore, if light can reduce the volume of sound, there must be some kind of mass. Maybe Earth's gravitational pull is not enough to draw in light...However, anything with mass is a candidate to be pulled in by a gravitational force. Maybe in the case of stars?

[chessboxer]

everyone needs to brush up on their theory of relativity, myself included.
gravity does affect light, and time too.
go einstein.

[RicePolice]

Now you got me thinking...See, if light can affect sound travel. Light must have some kind of mass, even if its minimal. Sounds is caused by vibrations that affect the flow of air correct? Therefore, if light can reduce the volume of sound, there must be some kind of mass. Maybe Earth's gravitational pull is not enough to draw in light...However, anything with mass is a candidate to be pulled in by a gravitational force. Maybe in the case of stars?

So you're saying if you shine a flashlight at a scale, the light emitted will weigh something? Light has no mass and doesn't actually effect sound directly. Sound is transmitted vibrations of any frequency. It's the heat in the air cause by sun light that reduces the range of sound (vibrations in heated air). Night time (absense of light/heat) is optimum period at which sound can travel greater distances. Same with water. Sound traveling in cold water has less resistance to go through than if it were traveling in hot water... My 2cents.

[Dirty Harry]

This whole discussion is interesting, but has gone completely the wrong way. It's not about whether different forms of energy are affected by gravity. It's the electrolyte in the battery, full vs. discharged. I know what you're talking about... I've said the same thing before (difference in weight... charged cells feel heavier).

[RicePolice]

everyone needs to brush up on their theory of relativity, myself included.
gravity does affect light, and time too.
go einstein.

The Theory of Relativity is just a theory, not law. Plus E=mc2 is being disproven because of, but not soley based on, the fact that scientists of Einstiens time believed the earth was the center of the universe and there were theories to prove that, just as now there are theories to back up E=mc2 and is believed to be a valid scientific law.

[KillerCam282]

So you're saying if you shine a flashlight at a scale, the light emitted will weigh something? Light has no mass and doesn't actually effect sound directly. Sound is transmitted vibrations of any frequency. It's the heat in the air cause by sun light that reduces the range of sound (vibrations in heated air). Night time (absense of light/heat) is optimum period at which sound can travel greater distances. Same with water. Sound traveling in cold water has less resistance to go through than if it were traveling in hot water... My 2cents.

Hmmn...I need to look into this. This is all forgotten for me. I look at it as how sound gets deadened by material. Also, I said light definitely has some kind of mass, due to the fact it has molecules. That enables it to give off heat, correct? Therefore, it must have some kind of weight even if its minimal. And the shine the light on the scale comment was Weak Sauce... . We are talking in the strict scientific sense. It must weigh something, IMO. Especialy if stars' gravity can effect it.

[chessboxer]

The Theory of Relativity is just a theory, not law. Plus E=mc2 is being disproven because of, but not soley based on, the fact that scientists of Einstiens time believed the earth was the center of the universe and there were theories to prove that, just as now there are theories to back up E=mc2 and is believed to be a valid scientific law.

please dont ever try and equate a hypothesis with a theory ever again, or reduce a theory to a hypothesis as you did without explicitly stating so.
the rest of your post is kind of a jumble to me from there.
at first you say that e=mc2 is being disproven, then you say that in the 1930's scientists were still geocentric, and then you say that theories now are being used to show e=mc2 is a law?
huh?
and if you really want to get technical, please explain to me how a law in science is so great anyways, as i need to know how it solves the problem of induction. since a theory doesnt do this, i need to know your basis for constitution of a law.
hut hut hike.

[RicePolice]

Weak sauce? well, just trying to not be scientific for a sec... can't be serious all the time.

[KillerCam282]

I mean, LIGHT HAS GOT TO WEIGH SOMETHING!!!! Its killing me. I know it has to. I mean, it has molecules because it has heat. I think it is just the closest thing to weighing absolutely nothing.

[chessboxer]

http://math.ucr.edu/home/baez/physic...ight_mass.html
what he said.

[RicePolice]

please dont ever try and equate a hypothesis with a theory ever again, or reduce a theory to a hypothesis as you did without explicitly stating so.
the rest of your post is kind of a jumble to me from there.
at first you say that e=mc2 is being disproven, then you say that in the 1930's scientists were still geocentric, and then you say that theories now are being used to show e=mc2 is a law?
huh?
and if you really want to get technical, please explain to me how a law in science is so great anyways, as i need to know how it solves the problem of induction. since a theory doesnt do this, i need to know your basis for constitution of a law.
hut hut hike.

getting too serious for me... I only know a few big words, and don't feel like pulling out the dictionary. Plus I haven't played football in about 2 years.

[gloryaccordy]

Energy and mass are one in the same. E=MC^2...

Technically speaking, your packs ARE heavier when they are charged with the potential energy they have...but consider this: a piece of uranium probably the size of...a camcorder?...had the energy to level those poor Japanese towns. Somehow, from that, I don't think the energy in your charger pack would be something you could weigh...

And as far as light having weight, it does...gravity bends light, so everything we see in the night sky isn't as it really is. A way to think of it is that space is a big rubber sheet, with everything spread out on it, so light travels on the 'straightest' path possible, but ultimately, it curves. We don't see it here cause nothing has that kind of gravity, but it's been observed in space...

Hope that answered your questions...