Re: Any physicist care to speculate about this idea?
- From: "gb6724@xxxxxxxxx" <gb6724@xxxxxxxxx>
- Date: Mon, 14 Apr 2008 16:02:57 -0700 (PDT)
On Apr 14, 5:15 pm, Martin Hogbin <goatNOSP...@xxxxxxxxxx> wrote:
gb wrote:
Using the break pedal, we can bring a very heavy object like a car to
a quick stop. Can we use the break pedal to achieve equal energy not
toward stopping but toward speed acceleration?
I came to the answer that yes. We can for example compress air with
the force of the break pedal, and compressed air can run a car and
produce equal force in acceleration given the right technological
advances.
See article on car running on compressed air:
http://www.msnbc.msn.com/id/6138972
Let's put it this way: How much energy would be needed to bring a one
ton object traveling at 100 kilometers an hour to a quick stop? Can we
produce that much energy in reverse engineering to accelerate a car
just as effectively to 100 kilometers an hour? Sure, there are hybrid
systems that are able to withdraw a lot of energy from the breaking
process. There is technology and space for taking energy from the
slowing car and use some of it to drive the car electrically later on.
So the question is, and we see what break pads do by using pressure to
force stop wheels, can we build energy out of a strong pressure that
we make with a break pedal? How many bars of pressure do these breaks
use? We know that the air car in the link above uses compressed air
tanks that are pumped with 300 bars of pressure, about 10 times more
pressure is used than what is inside a car's tire. This tank of
compressed air can run a car for 50 miles with top speed. It takes
four hours to compress the tank using electricity. When air is
compressed in such a tank, there is a lot of back pressure, and a lot
of energy is lost in the electric compression process, meaning the air
compressing motor has to work a lot to raise the PSI in this tank to
300. But how much energy is in a single compression used by the car's
break pedal, and how much energy can come out of this single pressing
down of the break pedal with a human leg force back into the motor
that runs on compressed air?
The question is how many cubic centimeters of compressed air with
300PSI we can produce with a single break pedal and how many seconds
of full acceleration that can provide to this air car engine. If I
would be a physicist I could probably calculate this.
The idea of recovering the energy lost in braking is well known. It
could be stored electrically or, as you suggest, as compressed air. The
energy that might be added by your leg when you press the brake pedal is
insignificant.
Martin Hogbin
I suspected that. I thought based on the air car that it can be
calculated
how much energy is in a break pedal, how much compressed air it makes
for a 30hp motor that runs on compressed air. A millisecond of power
from the I don't know, a thousand cubic millimeters of compressed air
that can be compressed by a break pedal, probably more cubic
millimeters.
The question and idea is: a break pedal can apply a large force over a
1 ton
car to stop it, that large force produced by the break pedal can
create
compressed air which in turn can run an air car for a period of time.
I was
wondering how long can a car like that operate on compressed air
produced
by foot.
.
- References:
- Any physicist care to speculate about this idea?
- From: gb
- Re: Any physicist care to speculate about this idea?
- From: Martin Hogbin
- Any physicist care to speculate about this idea?
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