Discussion Topic
Chemical energy sources are often portable
and provide large amounts of e...
Physics, 27.02.2020 21:58, briana21092005
Discussion Topic
Chemical energy sources are often portable
and provide large amounts of energy. Fossil
fuels are one kind of chemical energy source.
Most of the energy we use in the United
States is generated by the combustion of
fossil fuels. However, fossil fuel combustion
adds greenhouse gases to the atmosphere,
mostly CO2. One measure of the total
amount of greenhouse gases that are
emitted into the atmosphere each year is
called a carbon footprint. Read this article to
compare the carbon footprint of an average
person in the United States to an average
person around the world.
Knowing that greenhouse gases are
contributing to climate change, how can we
reduce our carbon footprint, particularly in
the United States? Could hydrogen fuel
replace fossil fuels in the future? Why or why
not? Should the size of a person's carbon
footprint be limited by law? Why or why not?
Answers: 1
Physics, 22.06.2019 06:30, corcoranrobert1959
At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid
Answers: 1
Physics, 22.06.2019 10:00, amyaacrawford86
Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.
Answers: 1
Physics, 22.06.2019 16:00, ggdvj9gggsc
Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.
Answers: 2
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