"John Williamson" wrote in message
...
dennis@home wrote:


"The Natural Philosopher" wrote in message
100mph is too fast to go through a town center but isnt fast enough to
escape to earth orbit.

That's not true.
its more than enough to escape earth orbit.
Go on argue with me and prove that you have no understanding of orbits or
space travel.

Escape velocity from the Earth is 25,000mph, roughly. Orbital speed for
the Earth at ground level is about 17,500 mph relative to the centre. At
100mph on a normal road, the reduction in weight is in theory just about
measurable, although in practice totally masked by aerodynamic effects.

But escape velocity isn't what he said.
100 mph is more than enough to escape earth orbit if you have propulsion
available.
You can go up vertically at walking speed and leave earth orbit if you have
the thrust available for long enough.

Escape velocity is what a rocket has to get to so its stored kinetic energy
is enough to escape earth orbit because it can't keep its engines going.


100mph is a *touch* too fast to be driving through a town centre, though,
unless you're in Monaco on Grand Prix day.

According to some its safe if you don't have an accident doing so.
A bit like saying shooting at people is safe as long as you miss.