On Jul 14 , at 6:09 PM, lps wrote:
This makes me wonder how much actual power is output by a liter of
fuel in my car. I am sure not all of the energy is transferred from
the fuel into forward motion.
Of course it's not!
A great deal of the energy from the burning gasoline goes out the
tailpipe as hot exhaust, or goes to friction in bearings, cylinders,
transmission, etc, not to mention the running of air conditioning,
lights, etc., friction with the air the car has to push through, heat
absorbed by the cooling system and put into the air via the radiator,
etc. etc. etc.
And even the energy of the car's forward motion is all lost to heat as
the brakes slow down the car by rubbing against the break shoes
(making them hot)*.
Regards,
Bill Hooper
Fernandina Beach, Florida, USA
*Unless, as in same hybrids and electric cars where regenerative
braking is used. That converts the forward motion energy into
electrical energy which is then stored in a battery where it can be
used again.
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SImplification Begins With SI.
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