Another science question need more nerds.

[staticflare]

So I have a question and I need it answered. So if I am in a room and I run ahead of me at exactly one meter at lightspeed, how much force would be applied to the surrounding area, also how much force would be required to stop me.

[Rad1um]

start :: object is v=x m/s =x ft/s = km/hr = mi/hr

stop :: d = x m = x ft


you're welcome

[staticflare]

start :: object is v=x m/s =x ft/s = km/hr = mi/hr

stop :: d = x m = x ft


you're welcome

Well damn anyone want to do that math for me? I'm a bit lazy.

[Azadina]

Well damn anyone want to do that math for me? I'm a bit lazy.

10 x 0 + 5 x 9 = ?

[Deleted]

Needs more info such as acceleration/timespan of which you want to increase/decrease velocity.

[alzoron]

The question is invalid, you can't move at the speed of light.

[Azadina]

The question is invalid, you can't move at the speed of light.

Exactly ^^ It's not a sensible math question, if it with begins with something impossible.

[May90]

So I have a question and I need it answered. So if I am in a room and I run ahead of me at exactly one meter at lightspeed, how much force would be applied to the surrounding area, also how much force would be required to stop me.

Infinite amount of force, since the energy of a massive object moving at the speed of light is infinite.

[sheggaro]

The question is invalid, you can't move at the speed of light.

you can in your imagination

[Twilight Cultist]

Rel Mass = m / (1 - √(v^2 / c^2)) --- Rel Mass is relativistic mass, v is velocity, c is the speed of light. As v approaches c, Rel Mass approaches ∞

So if you are moving at the speed of light, you would have infinite relativistic mass, meaning it would take an infinite amount of force to stop you.

[sheggaro]

Infinite amount of force, since the energy of a massive object moving at the speed of light is infinite.

I've never understood this

How come a finite speed makes an object have infinite energy/mass?

[Azadina]

I've never understood this

How come a finite speed makes an object have infinite energy/mass?

Acceleration requires energy. More you accelerate, the more you need.

[sheggaro]

Acceleration requires energy. More you accelerate, the more you need.

Yaeh but if the speed you're about to reach isn't infinite, why would you require infinite amounts of energy to get there?

I mean sure it'd be a really, really big number, but it can't possibly be infinite?

There is no such thing as infinite in a finite universe?! There's always the same amount of energy and matter after all.

[May90]

I've never understood this

how come a finite speed makes an object have infinite energy/mass?

Because the energy for high speeds v depends on those as the inverse square root of (1-v^2/c^2), where c is the speed of light. This factor is negligible for small speeds, so it can be omitted; but as you go closer and closer to c, the factor grows higher and higher, and for v=c you get infinity.

Now, why this happens physically is a different question, and it has to do with the properties of our 4-space. And those properties are a bit beyond the scope of this thread.

[Twilight Cultist]

I've never understood this

How come a finite speed makes an object have infinite energy/mass?

As something is moving faster and faster, it takes more energy to accelerate it. My earlier comment explains it.

[alzoron]

you can in your imagination

OK, he applies the force of 30 unicorns.

[Azadina]

Yaeh but if the speed you're about to reach isn't infinite, why would you require infinite amounts of energy to get there?

It's the top speed around. So you might aswell call it the infinite speed.

[sheggaro]

Because the energy for high speeds v depends on those as the inverse square root of (1-v^2/c^2), where c is the speed of light. This factor is negligible for small speeds, so it can be omitted; but as you go closer and closer to c, the factor grows higher and higher, and for v=c you get infinity.

Now, why this happens physically is a different question, and it has to do with the properties of our 4-space. And those properties are a bit beyond the scope of this thread.

When I read stuff like this I regret not getting a physics degree when I was a younger man still.

Oh well.

[May90]

When I read stuff like this I regret not getting a physics degree when I was a younger man still.

Oh well.

Popular explanation is that the closer you are to the speed of light, the more energy it takes to increase your speed just a bit more. You can get the speed equal to 0.9c, 0.99c, 0.99999999999c... And to get from 0.999999999990c to 0.999999999991c, you will require tremendous amount of energy. If you take all the matter in the Universe, convert it to energy and use all this energy to accelerate yourself, you might get a speed like 0.99999999999999999999999999999(who knows how many more)c, but that still won't be c.

But yes, to really understand where these things come from, you need, at least, to read a bit on special relativity, and that might require some level of physical knowledge to follow through.

[staticflare]

Hmm so an infinite amount of force is required to stop me. But how much force would be applied to that surrounding area if I just stopped running at lightspeed at 1 meter distance?