Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

Theoretical Physicists Are Getting Closer to Explaining How NASA’s ‘Impossible’ EmDrive Works
motherboard.vice.com ^ | 10/31/17 | Giulio Prisco

Posted on 11/01/2017 12:10:53 AM PDT by LibWhacker

click here to read article


Navigation: use the links below to view more comments.
first previous 1-2021-35 last
To: spintreebob

No, just the people from other parallel worlds will be demanding retribution for this world’s theft of their resources.


21 posted on 11/01/2017 4:47:07 AM PDT by Cvengr ( Adversity in life & death is inevitable; Stress is optional through faith in Christ.)
[ Post Reply | Private Reply | To 16 | View Replies]

To: LibWhacker

Has anyone calculated how long it takes to get up to the speed of light without putting humans under unnatural G forces? Then, calculate the time it takes to slow down. Our present natural gravitational force is 16 feet/second squared.


22 posted on 11/01/2017 5:01:22 AM PDT by jonrick46 (Trump continues to have all the right enemies.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: jonrick46
Our present natural gravitational force is 16 feet/second squared.

Not to be too pedantic here but ft/s^2 is not a force it is an acceleration. And the value you site is wrong for the gravitational acceleration at the Earth's surface. It is 9.81 m/s^2, 32.17405 ft/s^2.

Nonetheless; my calculation says that at 9.8m/s^2 it would take 0.95 years to get to the speed of light. This calculation is based on classical mechanics not taking into account relativistic effects.

23 posted on 11/01/2017 6:34:21 AM PDT by super7man (Madam Defarge, knitting, knitting, always knitting)
[ Post Reply | Private Reply | To 22 | View Replies]

To: Cvengr

Like future generations will demand retribution for leaving them with impossible debt?


24 posted on 11/01/2017 6:39:12 AM PDT by spintreebob
[ Post Reply | Private Reply | To 21 | View Replies]

To: JohnyBoy

So this is another ‘cold fusion’ type pipe dream?


25 posted on 11/01/2017 6:49:16 AM PDT by GOPJ ( http://fakehatecrimes.org/ - List of fake hate crimes against traditional/conservative Americans)
[ Post Reply | Private Reply | To 7 | View Replies]

To: Irishguy
the world will change and fast. we are on the cusp of a change i think.

Our President has hinted obliquely at this several times.

26 posted on 11/01/2017 6:51:04 AM PDT by RegulatorCountry
[ Post Reply | Private Reply | To 8 | View Replies]

To: super7man

And taking relativity into account? What then? Earth’s time? Traveler’s time?


27 posted on 11/01/2017 6:55:17 AM PDT by GOPJ ( http://fakehatecrimes.org/ - List of fake hate crimes against traditional/conservative Americans)
[ Post Reply | Private Reply | To 23 | View Replies]

To: GOPJ
And taking relativity into account?

Can't get there from here. ;o)

28 posted on 11/01/2017 7:46:13 AM PDT by super7man (Madam Defarge, knitting, knitting, always knitting)
[ Post Reply | Private Reply | To 27 | View Replies]

To: LibWhacker

Even if this works, what power source is used to generate the MW field? How much current is needed to create and effective thrust? How efficient is it? Does it require a power cord running to a nuclear station on earth ( sarc)?

If the force produced is in fact real, how “forceful” is it? ( Will it take moments or years to accelerate to useful velocity?)

Why not invent diLithium crystals and Warp dives? Or even impulse drives? We could plod along at .5 C at least, in “ limp home” mode. Oh, yeah, and invent hibernation too, or else we need cattle and hydroponic fields to tag along for the eons it would take to get anywhere....

2001 (a Space Odyssey) is already 16 years past and here we are still anchored to earth. C’mon scientists, get off your fourth points of contact!

Respectfully,

Luddite


29 posted on 11/01/2017 7:47:48 AM PDT by Manly Warrior (US ARMY (Ret), "No Free Lunches for the Dogs of War")
[ Post Reply | Private Reply | To 1 | View Replies]

To: super7man; GOPJ

Taking the rest of physics into account we can’t get going that fast. Super7 could probably explain it better but it is hardly worth the time. The point is all known workable drive systems have a maximum theoretical speed well below C.


30 posted on 11/01/2017 8:56:23 AM PDT by TalonDJ
[ Post Reply | Private Reply | To 28 | View Replies]

To: TalonDJ
explain it better but it is hardly worth the time

Hey, is that a pun?

31 posted on 11/01/2017 11:32:10 AM PDT by super7man (Madam Defarge, knitting, knitting, always knitting)
[ Post Reply | Private Reply | To 30 | View Replies]

To: SauronOfMordor

To explore the closest systems to us we need at least, AT LEAST light speed travel. Even then we’ll need self contained biospheres for the years in space humans will be subjected to. To efficiently explore systems close to us we need FTL, which may not be possible.

The first thing we need is to be able to get things into space cheap. It’s too expensive to get massive objects into space but that’s what we need. A space elevator, or some really cheap fuel.


32 posted on 11/01/2017 11:44:35 AM PDT by FreedomStar3028 (Somebody has to step forward and do what is right because it is right, otherwise no one will follow.)
[ Post Reply | Private Reply | To 5 | View Replies]

To: GOPJ

Cold fusion isn’t a pipe dream.

We can start a cold fusion reaction. We have.


33 posted on 11/01/2017 11:48:11 AM PDT by FreedomStar3028 (Somebody has to step forward and do what is right because it is right, otherwise no one will follow.)
[ Post Reply | Private Reply | To 25 | View Replies]

To: super7man

Great reply. This means, if one were to accelerate to the speed of lignt, one would not want to do it quickly. Likewise, they would have to slow down at a rate where inertia does not kill the humans or put them under unnatural forces. Ideally, both acceleration and deceleration would be at ideal rates to cause inertia forces to match the gravitation humans are used to on Earth. By you calculations, you use up almost two years in acceleration and deceleration. Alpha Centari is 4.367 light years away. You add two more years for the inertia effects.


34 posted on 11/01/2017 12:30:10 PM PDT by jonrick46 (Trump continues to have all the right enemies.)
[ Post Reply | Private Reply | To 23 | View Replies]

To: super7man

That depends on your reference frame.


35 posted on 11/01/2017 1:27:28 PM PDT by TalonDJ
[ Post Reply | Private Reply | To 31 | View Replies]


Navigation: use the links below to view more comments.
first previous 1-2021-35 last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson