mass and energy

del88

Just letting my imagination run free here.
I always find it interesting when you think about mass and energy....if i take off in a space ship my speed is measured from the point where i use energy to move in a forward direction....just like when I'm on the earth my speed is considered to be at zero yet the earth is traveling at loads of different speeds relative to lots of different objects.(43,200 MPH Towards Lambda Herculi...15,624 MPH Perpendicular to Galactic Plane...446,400 MPH Orbiting the Galactic Center...574,585 MPH Speed of Earth within Our Galaxy.
So when energy is exerted on the space craft it's total mass absorbs the energy adding it to it's total combined absorbed energy that all the little bits of mass that make it up have absorbed since the big bang
Maybe mass should be called energymass just like space is called space time because the 2 are one and the same thing...

Morbert

del88 wrote: »

Just letting my imagination run free here.
I always find it interesting when you think about mass and energy....if i take off in a space ship my speed is measured from the point where i use energy to move in a forward direction....just like when I'm on the earth my speed is considered to be at zero yet the earth is traveling at loads of different speeds relative to lots of different objects.(43,200 MPH Towards Lambda Herculi...15,624 MPH Perpendicular to Galactic Plane...446,400 MPH Orbiting the Galactic Center...574,585 MPH Speed of Earth within Our Galaxy.
So when energy is exerted on the space craft it's total mass absorbs the energy adding it to it's total combined absorbed energy that all the little bits of mass that make it up have absorbed since the big bang
Maybe mass should be called energymass just like space is called space time because the 2 are one and the same thing...

You will often see the phrase 'energy-momentum' in literature which is similar to space-time.

It should also be noted that the mass you are referring to is relativistic mass. Proper mass, as it appears in the energy-momentum equation

E^2 = p^2c^2 + m^2c^4

is the same for all observers.

del88

Morbert wrote: »

You will often see the phrase 'energy-momentum' in literature which is similar to space-time.

It should also be noted that the mass you are referring to is relativistic mass. Proper mass, as it appears in the energy-momentum equation

E^2 = p^2c^2 + m^2c^4

is the same for all observers.

cheers

So all mass has energy-momentum...is it's total measured from the point at which all mass first had energy exerted on it..ie the big bang.
Does all mass when broken down to it's smallest denomination experience this energy-momentum independently and differently
Is time the by product of it's differences .

FISMA

Einstein's famous equation breaks down in the end to

E = mc^2

Since c is a constant, c^2 is also a constant.

You can remove the equals sign and the c square "= c^2" and replace it with the proportionality sign, which looks like alpha - or a fish, I will use ippt

Thus E ippt m

So Energy is proportional to mass. When you speed something up, its KE increases, and so to does its mass.

Thus, the problem getting any piece of mass to go the speed of light. To get to the Universe's speed limit you will need all the energy in the Universe and then some.

Morbert

del88 wrote: »

cheers

So all mass has energy-momentum...is it's total measured from the point at which all mass first had energy exerted on it..ie the big bang.
Does all mass when broken down to it's smallest denomination experience this energy-momentum independently and differently
Is time the by product of it's differences .

For clarity's sake, I'm going to use natural units (so the constant c = 1)

The energy-momentum equation is then E^2 = p^2 + m^2. We can see that energy is equated with a combination of both mass and momentum. If we rearrange the equation we get m^2 = E^2 - p^2. What does this tell us? Well, since we are working with a very special type of geometry called minkowski geometry, we see that mass is actually a measure of the 'length' of an energy-momentum vector (sometimes called a 4-momentum vector, in relation to the 4 dimensions of spacetime). So you wouldn't really say that mass has energy-momentum. Instead, mass is proportional to the magnitude of the energy-momentum vector of a system.

It must also be stressed that this mass, m, is invariant. So when a shuttle speeds up its mass doesn't increase, and relativistic effects emerge through its momentum instead.

The concept of relativistic mass is essentially the total energy E of the system, and while it is conserved, it is not invariant. It can be useful for calculations but I find it unhelpful conceptually.