Why airplanes taxi

wrote in
:

On Feb 6, 1:20 pm, Bertie the Bunyip wrote:
Mxsmanic wrote
:

writes:

Fixed-wing aircraft taxi because their wheels reduce friction as
they move forward on the ground.

So, logically, spacecraft in the frictionless environment of outer
space should immediately accelerate to the speed of light.

No, it takes a few minutes. Don't you watch star trek?

Bertie

It actually depends on the volume and pitch of the 'rrorrr-rrOORRR'
sound and angle at which Mr. Scott finds himself clinging to the fence
in front of the engines.

Smoke escaping out of various panels on the bridge seems to help as
well.

You sure this isn't a GM product we're talking about here?


Bwwahwhahwhahw!


Bertie

Mxsmanic wrote in
:

terry writes:

The resistance is a function of the density of gas molecules not
pressure
density is related to pressure by
D=PM/RT
M=molecular wt
P=pressure
R=gas constant
T=temperature ( absolute )
ie the lower the temperature the higher the density
so what is the temperature in interestella space?

The classic gas laws only work when a volume of gas is contained.


N ope

Bertie

Mxsmanic wrote in
:

Clark writes:

... it's not fair to pick on the incompentent...

Are you being facetious?


Are you being a tit?

bertie

WingFlaps writes:

All the gas laves can be combined to:

PV=nRT and this is true everywhere. It's an energy equation and so can
be applied to any volume.

Set V to infinity (an unconfined gas) and solve for the rest.

It would take infinite amount of energy to accelerate any non-zero
mass to the speed of light.


On Feb 9, 12:37*am, wrote:
So, logically, spacecraft in the frictionless environment of outer space
should immediately accelerate to the speed of light.

Some haphazard math here.. if space is indeed entirely frictionless,
which I highly doubt, then to accelerate a body of weight 1kg (2.2
lbs) to the speed of light (using a constant force of 1N (or 1 m/sec2
acceleration) would require a distance of 4.5*(10^16) meters or about
45000000000000 km which is about 300 billion miles. The work done/
energy needed would be about 450 trillion joules.
The time needed to achieve this feat would be about 9.5 yrs.. so no
its not instantaneous

On Feb 10, 4:36*pm, Tina wrote:
It would take infinite amount of energy to accelerate any non-zero
mass to the speed of light.

Ah an oft stated idea but why? Is E not 0.5MC^2 ?

Where's the Ken when we need it?

Cheers

On Feb 10, 4:33*pm, Mxsmanic wrote:
WingFlaps writes:
All the gas laves can be combined to:

PV=nRT and this is true everywhere. It's an energy equation and so can
be applied to any volume.

Set V to infinity (an unconfined gas) and solve for the rest.

n would then be infinite too for any existant gas density so you've
set up infinity=infinty. Such insight as you posses blinds me with its
brilliance.

Cheers

In article ,
WingFlaps wrote:

It would take infinite amount of energy to accelerate any non-zero
mass to the speed of light.

Ah an oft stated idea but why? Is E not 0.5MC^2 ?

reaching way way Way WAY back into college physics let's see if I remember
this correctly... because mass increases with velocity. If pressed, I may
even be able to find the formula in my quantum text.

--
Bob Noel
(goodness, please trim replies!!!)

Mxsmanic wrote:
WingFlaps writes:

All the gas laves can be combined to:

PV=nRT and this is true everywhere. It's an energy equation and so can
be applied to any volume.

Set V to infinity (an unconfined gas) and solve for the rest.

Since there is no infinite volume, what would be the point?


--
Jim Pennino

Remove .spam.sux to reply.

It would take infinite amount of energy to accelerate any non-zero
mass to the speed of light.


True, I just wanted to stay within the realms of Newtonian mechanics
for simplicity because the poster seemed to imply that a body will
reach a velocity of c if there is no friction instantaneously..