24k views

### Increase in Mass with Velocity [duplicate]

I just had a confusion. Does the mass of the body actually increase when it is moving with a certain velocity? Or does it only look like the mass has increase to another observer. How can the actual ...
3k views

### How do Einstein’s equations support mass gain in particle accelerators? [duplicate]

Possible Duplicate: Why does the mass of an object increase when its speed approaches that of light? A charged particle that is accelerated through a particle accelerator like CERN undergoes this ...
128 views

### Does the mass of a particle increase with increasing velocity [duplicate]

In the chapter of magnetic effect of current I came across cyclotron limitations. Statement: The cyclotron cannot accelerate the particles to velocities as high as comparable to the speed of light. ...
160 views

### Relativistic momentum and mass [duplicate]

Is there even a relativistic mass or just relativistic momentum? How does one reason to prefer one over another? What is the problem with saying a hot gas will have more mass/inertia to it?
105 views

### Extra mass due to near light like speeds [duplicate]

Why does mass seem to increase as you near the speed of light?
34 views

### Significance of relativistic mass [duplicate]

The mass which a body has on rest is called it's rest mass and the mass when it travels at some speed relative to a frame, it's mass increases by gamma factor. But I was thinking how actually can it's ...
32 views

### Mass dilation in general relativity [duplicate]

Does mass dilate in general relativity. For example if I was accelerating will my mass dilate? Thanks
4k views

### How come waves and particles can have energy without having mass?

I just want to point out that I'm still in highschool and I don't really have any advanced education within physics, however, this is something that has been on my mind. I may just be completely wrong ...
31k views

### Is $E^2=(mc^2)^2+(pc)^2$ correct, or is $E=mc^2$ the correct one?

I have been having trouble distinguishing these two equations and figuring out which one is correct. I have watched a video that says that $E^2=(mc^2)^2+(pc)^2$ is correct, but I do not know why. It ...
14k views

### What does it mean to say that mass “approaches infinity”?

What does it mean to say that mass "approaches infinity"? I have read that mass of a body increases with the speed and when the body reaches the speed of light, the mass becomes infinity. What ...
3k views

### Special Relativity and $E = mc^2$

I read somewhere that $E=mc^2$ shows that if something was to travel faster than the speed of light then they would have infinite mass and would have used infinite energy. How does the equation show ...
5k views

### What matter in the original atom bomb is converted to energy?

When an atom bomb goes off some matter is converted to energy according to $E = m c^2$. I'd like to know exactly what matter in the original atom bomb is converted to energy. Is it protons, neutrons, ...
8k views

### Mass of particle near light speed in a medium

I am trying to get a common understanding from these two previous questions: Why does the mass of an object increase when its speed approaches that of light? What happens if light/particles exceeded ...
On one hand, in the classical electrodynamics polarization of transparent media yields in lowering the speed of light by the factor of $n=\sqrt{\epsilon_r \mu_r}$ (refractive index). On the other, in ...