It is important not to confound matter and mass! Mass is a measure of inertia/gravity and inherent to *all* forms of energy. Light reflected between mirrors increases the mass of that volume; an empty battery has some femtograms less mass. E = mc2 states how this mass is proportional to the more abstract concept of bookkeeping energy which is related temporal symmetry, i.e. it is conserved when the dynamics doesn't change in time. Matter on the other hand is a specific physical system of fermionic particles (electrons, quarks,...). The fact that they can be converted into bosonic photons has nothing to do with E=mc2. The energy before and after the conversion is the same. Matter is not converted into energy: Matter has energy (and therefore mass) and so do the photons which are not a form of energy but a different physical state with the same energy/mass.
@@lynx_pubg_mobile Sorry. I still don't understand. Is this about something in the video? If so, please give the *time* in the video, so I can check. Thanks.
Hi. From a practical point of view, matter is a very bad way to store energy - it is extremely difficult to convert the matter to energy or vice versa.
Steve4Physics Unless you're storing it as equal masses of matter and antimatter! But then you'll have some containment problems, won't you? (I don't think the Container Store has quite the right boxes for that!)
ffggddss You can't store matter and antimatter together - they would immediately annihilate! It is only possible to store antimatter if it is totally isolated from normal matter. To provide an energy source, you would then have to gradually release the antimatter to allow it to come into contact with normal matter. Technically this would be extraordinarily difficult. Containmenr is very difficult. At present we only have the technology to create and control tiny amounts of antimatter - the practical probems of producing and controlling larger amounts are immense.
Steve4Physics Yeah, that was pretty much my point! (I maybe should have mentioned that I'm a physicist.) I mean if we've been having trouble for decades just magnetically confining ordinary matter in the form of plasma (Tokamak, et seq.), then how are we gonna fare with, what?, an antimatter plasma of antiprotons and positrons? Especially since, as you mention, we haven't been able to make more than minuscule quantities of anti-hydrogen. Guess we'll have to wait for Star Trek to come true!
Theirs only one thing that you haven't explained.if the speed of light is so fast then why share it.If a car has max speed of 100 mph then you can't just multiply by 100 to equal 10000mph for convenience so that you can multiply by 1kg to equal 10000 joules because if you multiply 100 by 1it only equal 100
A gamma photon has no *rest mass*. The ‘m’ in E=mc² is *rest mass* and can’t be directly applied to photons because photons are never at rest (always moving at ‘the speed of light’). The question should ask for the gamma photon’s *equivalent rest mass*. 1.1125941x10^27 kg is a *huge* mass - more than the mass of the Earth! And 8 significant figures is way too many unless you are working to a precision of 1 part in 100 million. What was the problem you were solving?
I think you have made 2 mistakes. 1. Two grams of water is 0.002kg. That’s what you should use for the mass. You have incorrectly used 0.018kg; maybe this is because the mass of 1 mole of water is 0.018kg, but this is not relevant here. 2. You have worked out c² incorrectly. Note that (3x10⁸)² = 9x10¹⁶, not 3x10¹⁶.
@@Steve4Physics converted 2g to kg mass standard S.I is kg only , and rest I made similar and joule = kg m^2 /s^2 So I made .002kg*9*10^16 m^2/s^2 , next step .018*10^16 kg m^2/s^2 .where I made wrong I can't get you
@@hariharan-yi8tf 0.018x10¹⁶ is technically correct but is not in ‘standard form’ (sometimes called ‘scientific notation’ or ‘exponential notation’). In an examination you would probably lose a mark! Standard form is often used in science and engineering. The value in front of the power of ten is called the ‘mantissa’. The mantissa must be equal to or greater than 1 and less than 10. So 1.8x10¹⁴ is the correct format here. Here is another example: 123x10⁶ is not in standard form. 1.23x10⁸ is the same value but correctly expressed in standard form.
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Thanks for posting this video. It's surprisingly difficult to find a clear, simple walk-through of problems like these.
Thank you very much for explaining so well.
Thanks again.
Well explained and straight foward to the point! I liked that!
Outstanding
It is important not to confound matter and mass! Mass is a measure of inertia/gravity and inherent to *all* forms of energy. Light reflected between mirrors increases the mass of that volume; an empty battery has some femtograms less mass. E = mc2 states how this mass is proportional to the more abstract concept of bookkeeping energy which is related temporal symmetry, i.e. it is conserved when the dynamics doesn't change in time.
Matter on the other hand is a specific physical system of fermionic particles (electrons, quarks,...). The fact that they can be converted into bosonic photons has nothing to do with E=mc2. The energy before and after the conversion is the same. Matter is not converted into energy: Matter has energy (and therefore mass) and so do the photons which are not a form of energy but a different physical state with the same energy/mass.
Thanks so much Sir Steve. New follower and Frìend here
Hey water can be changed simple with Electrolysis!!!!!!!! Hydrogen and oxygen gas then back to water when burned e=mc2
Sir wha per 9 ke saat 10 ki power 9 whyy
Sorry, I don't understand the question.
@@lynx_pubg_mobile Sorry. I still don't understand. Is this about something in the video? If so, please give the *time* in the video, so I can check. Thanks.
Thank you for posting this video Sir.
Nice
Is matter an effective way to store energy?
Hi. From a practical point of view, matter is a very bad way to store energy - it is extremely difficult to convert the matter to energy or vice versa.
Steve4Physics okay. BTW im the guy you send this video to on yahoo answers :)
Steve4Physics Unless you're storing it as equal masses of matter and antimatter! But then you'll have some containment problems, won't you? (I don't think the Container Store has quite the right boxes for that!)
ffggddss
You can't store matter and antimatter together - they would immediately annihilate! It is only possible to store antimatter if it is totally isolated from normal matter. To provide an energy source, you would then have to gradually release the antimatter to allow it to come into contact with normal matter.
Technically this would be extraordinarily difficult. Containmenr is very difficult. At present we only have the technology to create and control tiny amounts of antimatter - the practical probems of producing and controlling larger amounts are immense.
Steve4Physics Yeah, that was pretty much my point! (I maybe should have mentioned that I'm a physicist.)
I mean if we've been having trouble for decades just magnetically confining ordinary matter in the form of plasma (Tokamak, et seq.), then how are we gonna fare with, what?, an antimatter plasma of antiprotons and positrons?
Especially since, as you mention, we haven't been able to make more than minuscule quantities of anti-hydrogen.
Guess we'll have to wait for Star Trek to come true!
Theirs only one thing that you haven't explained.if the speed of light is so fast then why share it.If a car has max speed of 100 mph then you can't just multiply by 100 to equal 10000mph for convenience so that you can multiply by 1kg to equal 10000 joules because if you multiply 100 by 1it only equal 100
Sir how value be 1.8×10 power 14 Jole
If we multiply (3×10 Power 8×2 ) the is be (3×10 power 16 )
2 grams = 0.002kg
mc² = (3x10⁸)² x 0.002 = (9x10¹⁶) x 0.002 = 1.8x210¹⁴
Ya me too not sure , I got .018*10^16J
Their is a light battery from a material of opaque and color changing stone I believe a photon has a resting mass
They actually made photonic matter solids must have mass
Was the sound distortion was it a test or a frequency come on come on tell me the truth 😂
If ive done it correctly the mass of wich gamma would have is 1.1125941x10^27 kg but gamma doesnt have any mass
A gamma photon has no *rest mass*. The ‘m’ in E=mc² is *rest mass* and can’t be directly applied to photons because photons are never at rest (always moving at ‘the speed of light’). The question should ask for the gamma photon’s *equivalent rest mass*.
1.1125941x10^27 kg is a *huge* mass - more than the mass of the Earth! And 8 significant figures is way too many unless you are working to a precision of 1 part in 100 million.
What was the problem you were solving?
how did he go from 10^16 to 10^14 😭
Hi. Please give the time in the video, as I can't tell which calculation you mean.
Finally I found it
Haha I'm also found it
For 1st sum I got = .018*3*10^16J
I think you have made 2 mistakes.
1. Two grams of water is 0.002kg. That’s what you should use for the mass. You have incorrectly used 0.018kg; maybe this is because the mass of 1 mole of water is 0.018kg, but this is not relevant here.
2. You have worked out c² incorrectly. Note that (3x10⁸)² = 9x10¹⁶, not 3x10¹⁶.
@@Steve4Physics converted 2g to kg mass standard S.I is kg only , and rest I made similar and joule = kg m^2 /s^2
So I made .002kg*9*10^16 m^2/s^2 , next step .018*10^16 kg m^2/s^2 .where I made wrong I can't get you
@@hariharan-yi8tf
That is now correct, but not complete. Note:
a) 0.018*10¹⁶ = 1.8*10¹⁴
b) 1kg m²/s²= 1J
So the final answer is 1.8*10¹⁴J.
@@Steve4Physics Ok so u have made .018*10^16 to 1.8*10^14 , so both are correct only right?
@@hariharan-yi8tf 0.018x10¹⁶ is technically correct but is not in ‘standard form’ (sometimes called ‘scientific notation’ or ‘exponential notation’). In an examination you would probably lose a mark!
Standard form is often used in science and engineering. The value in front of the power of ten is called the ‘mantissa’. The mantissa must be equal to or greater than 1 and less than 10. So 1.8x10¹⁴ is the correct format here. Here is another example:
123x10⁶ is not in standard form.
1.23x10⁸ is the same value but correctly expressed in standard form.