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# Is rest mass the same as rest energy? Physics AS level

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. Is it? or is it?

Also how would I calculate the rest mass of a neutral pion using values from the data sheet?
Is it? or is it?

Also how would I calculate the rest mass of a neutral pion using values from the data sheet?
Rest energy is technically 0, mass can never be zero
3. (Original post by ComputerMaths97)
Rest energy is technically 0, mass can never be zero
According to the data sheet... the rest energy in MeV is only zero for photons and neutrinos? :/ How would I calculate the rest mass of a neutral pion using the data sheet?
Is it? or is it?

Also how would I calculate the rest mass of a neutral pion using values from the data sheet?
Does your data sheet have the rest energy of a neutral pion on it? Otherwise, there's no way of calculating that without a fair bit of additional info.

Can you post the exact question and/or a photo of the relevant bit of your datasheet?

5. (Original post by lerjj)
Does your data sheet have the rest energy of a neutral pion on it? Otherwise, there's no way of calculating that without a fair bit of additional info.

Can you post the exact question and/or a photo of the relevant bit of your datasheet?

It does tell us the rest energy of a neutral pion.. the rest energy is: 134.972 MeV
6. Does mass=energy??
7. (Original post by thefatone)
Does mass=energy??
Ah, you can use E = mc^2 but I have no idea how to use it..
I assume you make rest energy = mass * speed of light in a vacuum ^ 2
i.e. for a neutral pion, 134.972*10^6= rest mass * (3.00*10^8)^2
so rest mass can be calculated
Ah, you can use E = mc^2 but I have no idea how to use it..
I assume you make rest energy = mass * speed of light in a vacuum ^ 2
i.e. for a neutral pion, 134.972*10^6= rest mass * (3.00*10^8)^2
so rest mass can be calculated
lol i don't even know enough about physics(even though i take it for A level) to answer this.

I think the theoretical answer is yes because that's how photons have no mass but carry energy?
but for your exam let's just say they're not xD
9. (Original post by thefatone)
lol i don't even know enough about physics(even though i take it for A level) to answer this.

I think the theoretical answer is yes because that's how photons have no mass but carry energy?
but for your exam let's just say they're not xD
Hahah i guess we're both learning xD

I think photons are a special case that E=mc^2 doesnt apply to
Hahah i guess we're both learning xD

I think photons are a special case that E=mc^2 doesnt apply to
i have no idea (insert not sure emoti)
Hahah i guess we're both learning xD

I think photons are a special case that E=mc^2 doesnt apply to
Photons have no rest mass and no rest energy. This is slightly pointless however, because photons cannot be at rest.

Which is because their rest mass is 0. Just avoid thinking about photons too much. Their energy is all kinetic, not rest energy.
Ah, you can use E = mc^2 but I have no idea how to use it..
I assume you make rest energy = mass * speed of light in a vacuum ^ 2
i.e. for a neutral pion, 134.972*10^6= rest mass * (3.00*10^8)^2
so rest mass can be calculated
This is correct.
13. (Original post by lerjj)
This is correct.
Thanks a bunch!!

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