# Specialy theory of relativity

1. Mar 12, 2008

### rojasharma

use the equation m=mo/sqrt(1-v^2/c^2) to show that travelling at the speed of light or beyond is impossible.

2. Mar 12, 2008

### Marco_84

1. what is the limit of that expression whene v--->c???

2. what is an immaginary mass???

think
marco

3. Mar 12, 2008

### rojasharma

mo is the mass of the object measured in the refrence frame in which it is at rest. m is the mass of the object as measured in a refrence frame moving with speed. in the equation v can never equal to c.....it will....be less because of sqrt 1-v2/c2

4. Mar 12, 2008

### Marco_84

yes bu why u cannot reach c??? what kind of singularity u get??? what does it mean physically???

ciao

5. Mar 12, 2008

### Dick

It's best to think of the m in your equation as the total energy of the object relative to the rest frame (including the E=m0*c^2 energy). So what happens to total energy as v approaches c?

6. Mar 12, 2008

### rojasharma

the energy approches infinity?

7. Mar 12, 2008

Yessss.