When automobiles are designed, engineers try to maximize their fuel efficiency. Even with modern technology, today's most efficient vehicles can only attain about 30% efficiency. That means of all the chemical energy of the fuel put into an automobile, only 30% of the fuel results in car motion. Which statement best explains why this happens?
Much of the energy is destroyed.
Most of the energy is transformed into mass.
Most of the energy becomes chemical energy.
Much of the energy is transformed into heat.
2 answers
Much of the energy is transformed into heat.
In the diagram below, light from the Sun strikes a beach (Z). The beach sand gains heat then warms the air that is immediately above it (X) and the sand that is immediately below it (Y).The warm air rises and is replaced by cool air (W). Which point indicates convective heat transfer?
(1 point)
Responses
Y
Y
Z
Z
W
W
X
X
Skip to navigation
(1 point)
Responses
Y
Y
Z
Z
W
W
X
X
Skip to navigation
1 answer