Endercreeper01

Hmm... Tell me a good book on areodynamics? And discuss your points, i have all day. And how is the cos wrong? With a 2D plate, then it should be D cos θ, where D is the coefficient of drag for a plate and θ is the angle between the plate and the axis orthogonal to the direction of motion

Ya But the input energy must equal the energy from the explosion

Because of the logic of this. Cd is proportional to cos θ and the constant of proportionality would be the coefficient of drag for a plateSo why don't you think it works?

And what would it be then for supersonic speeds?

I like this

I meant the angles for only the parts that the air would hit against, and even if it was zero, then it would be D according to this theory because the cosine of 0 is 1. How so?And this theory is just dependent on the coefficient of drag of a 2D plate, so it can work. Why shouldn't it? And basically, the air wouldn't be hitting against any angle 90 degrees or greater, so we would just exclude all angles greater then or equal to 90 degrees

I have made a way to calculate a coefficient of drag based on what it would be if it was just a plate. I will give the coefficient of drag of a plate a name. I will just refer to it as just D. So, lets start simple. Lets say that we had a 2D plate and it was tilted at an angle θ from the x axis (axis orthogonal to direction of velocity. Then the drag coefficient would be Dcosθ. Now lets say it was not 1, but 2 plates and they are connected somehow. Now you have 2 angles, θ1 and θ2. If θ1=θ2, then it is still Dcosθ, but if θ1#θ2, then you need to find the average angle, or (θ1+θ2)/2 and so it is Dcos(1/2(θ1+θ2)) In fact, you can do this with a shape with any number of sides, you just need to find the average angle θavg,and just find the cosine of that angle and then multiply by D. So we can just write it as Cd=Dcos((Σθ)/n), where n is the number of angles. So then is this correct? And also, what would the value of D be?

You know how if you have an object and you put a force on it, its not the whole object that moves at the same time, but instead, the force pushes the object and goes through it at the speed of sound? Well, what is this like when you only push a particle, such as an electron? Does it travel through the electron at the speed of light?

Is it possible to get energy from a mass traveling at a speed close to the speed of light?

If you have negative energy, is it possible to make negative mass using the negative energy? And also, if you can convert it to mass, are you able to accelerate that mass to speeds close to the speed of light so that you would get more negative mass?

Actually, is a warp drive really able to go faster then 2c? Space-time gravitational waves move at the speed of light, so that means that it contracts and expands at the speed of light, so doesn't that mean a warp drive can only go as fast as 2c?

What is the christoffel symbol of the second kind them for the swartzchild metric?

Then what is the riemann tensor for the interior?

Ok, mabey we can't do intergalactic soace travel, but we can do interstellar

we can stop whenever we get to another planet to get more fuel Tell me all about it. Relative to earthlings, time slows down for the spaceship and so it takes longer for them to age and they both agree on a certian time it takes themAnd even if we can't do intergactic space travel, we can do interstellar

what is a vacuum solution?

Does anyone know what Rab is in the swartzchild solution?

Yes, but it still works if we find a way around those things

Schwarzschild metric[edit source | edit] Besides the flat space metric the most important metric in general relativity is the Schwarzschild metric which can be given in one set of local coordinates by where from Wikipedia oh

then how would you calculate the determinant of a 4x4 matrix? and yes, I do and it is actually the swartzchild metric: Schwarzschild metric[edit source | edit]Besides the flat space metric the most important metric in general relativity is the Schwarzschild metric which can be given in one set of local coordinates by

sorry that is a glitch that happens on my computer

Intergalactic space travel is possible and will not take a huge amount of time to get there because of special relativity. If we go at speeds very close to the speed of light, then the time it takes relative to us and the length of the trip relative to us would be shorter because of special relativity. Time is relative, and in special relativity, then if an observer sees something with a relative velocity v, then the time that passes for that object relative to the observer t'=t(1-v2/c2)1/2. Same with length. The length would be l'=l(1-v2/c2)1/2. But this is relative. Relative to us, then we are staying still, and everything else is moving, so then everything else contracts by that amount, making t a shorter trip. And same with time dilation. Relative to us, it seems everything else slows down. And because of this, then intergalactic space travel is possible and will not take so much time. Is this correct?

the Swartzchild metric (using spherical coordinates are t, r, Θ, Φ) ds2=(1-2GM/rc2)dt2- (1-2GM/rc2)-1dr2-r2(dΘ2+r2sin2ΘdΦ). The metric tensor, gab=ds2/Σdxadxb. If you work everything out, then it becomes -r4sin2θ (1-m/r) and (1-m/r)-1 cancel out and make -1, and the other part becomes r4sin2θ and so it all becomes -r4sin2θ

gab is the meric tensor

The swartzchild metric gab=-r^4sin^2θ. Why doesn't this have to do with mass?