2) Today's cars are about 25 % efficient, which means that only 25% of the energy is actually used to propel the car forward, the remainder is lost due to heat loss to the
2) Today's cars are about 25 % efficient, which means that only 25% of the energy is actually used to propel the car forward, the remainder is lost due to heat loss to the
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Transcribed Image Text:Experiment 1: How much energy is there in 1gallon of gas?
Imagine you have a 1000 kg car (2200 lb), which gets 40 miles
to the gallon. This means that the car will burn 1 gallon of
gasoline in order to travel 40 miles down the road (at constant
speed without needing to stop).
1) Determine how much energy (in Joules) is produced by
combusting 1 gallon of gasoline. (This has to be looked up
on the internet)
2) Today's cars are about 25 % efficient, which means that
only 25% of the energy is actually used to propel the car
forward, the remainder is lost due to heat loss to the
environment, friction, wind resistance, etc. Older cars back
in the 1950s and 1960s had an efficiency between 10% and
15%. Calculate the gas mileage for cars back then.
3) Imagine a flat straight road 40 miles long. How long
would it take for 2 people to push a 1000 kg (2200 lb) car
(at walking speed) a distance of 40 miles? Make
assumptions on how fast 2 people can push a 1000 kg car
and for how long (how many hours) they can push that car
in a day at that speed.
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