auroraloose wrote:

Darkphoenix3450 wrote:

You seem good at math so assume you can understand what changes you have to do to your formulas. 1.

** The railgun is on a space station not on earth so G-force is not a factor.**(allowing to reach greater speeds much quicker without affecting the passengers. 2. The computer onboard the shuttle controls the sails, not to be used to propel the object, but instead used to adjust the path in witch the shuttle is moving allowing shuttle changes to direction, course correction. 3, structural soundness of shuttle (shuttles outer shell will be shaped almost egg like, created from a titanium, Tungsten highbred created using explosion welding.) 4. Of course targets for colonization will be found before launch. After all we are already doing that, and found 138 or so possible earth like planets that can meet are needs. 5. you forgot to add in speed + time dilation into you factoring. 6. this is a one way trip so landing would be most likely a parachute style. Now with those factors feel free to readjust your numbers.

iriomote seems to know what he's talking about. All of these points (except the relativity one) are basically irrelevant to the calculations - and the part in red is complete nonsense: Newton's second law says that force equals mass times acceleration. Gravity is not necessary for acceleration. If you're being accelerated by a railgun, that's acceleration, and you're going to experience a force (crushing you). Whether or not you're in space has nothing to do with it.

Now, if iriomote did indeed forget the relativistic correction - which we don't even know - it wouldn't change things much: at 8.5% of the speed of light, you'd multiply the distances by about 0.97 - and hence the necessary time by 0.97. I don't remember the correction during acceleration off the top of my head, though.

For the other questions, I think I agree with Ravenstein's opinion. I should also say that EM drives are nonsense, because they violate conservation of momentum.

'Ok lets talk science.. A spaceship could get to Pluto in 18 to 20 days by accelerating at 1g all the way, but reversing direction halfway between so it can come to a stop. If you don't care to come to a stop, it's only 13 days if one accelerates at 1g all the time.

'The Human Body can withstand a Constance of 5g. So change in time in going from rest to 0.99 c (c being speed of light)

t = change in momentum divided by the force,

the force being a constant (mrest) x (a), where

mrest is the mass of the object at rest

and 'a' is the acceleration of the object.

At relativistic speeds, the relativistic mass is considerably larger than

the rest mass, or

mass = mrest divided by the square root of (1 - beta squared), where

beta is the ratio of the object's speed and the speed of light (v/c)

The velocity is just 0.99 c, or the relativistic momentum is

p = [ mrest (beta) c ] divided by the sq. root of (1 - beta squared)

If beta is 0.99, 1-beta is 0.01 and the square root of same is 0.1, or

p = mrest (0.99) c / 0.1 = 9.9 mrest c

Finally,

time = change in momentum / force

= [ 9.9 mrest c ] / [ mrest a ] = 9.9 c / a

That's the time elapsed in accelerating from rest to 0.99 of the speed of

light is simply 9.9 times the speed of light divided by the acceleration

rate.

For c = 3 x e 8 meters per second and

g = 9.8 meters / second second [ or meters per second squared ],

and knowing that 1 year equals 3.156 e 7 seconds

at 5g it takes about 2 years to reach 0.99 c.

Now we need to add in Time Dilation

t’: is the time that passed by for the moving clock;

t: is the time that passed by in the reference system;

v: is the speed of the moving clock;

c: is the speed of light.

With this formula we can understand how long it take to reach a planet 25 light years away or more, and but also the time inside the ship that has passed.

Just so you know using this math if I was to leave earth to head to another planet 20 light years away at the age of 36, I still be under 50 by the time I make it. So yes We can live long enough to travel to other planets around other stars.