PV Gap

Minnie Said:

i really need help with this?

We Answered:

I bet this is in your text book and was discussed during class, but when you need an extra source for well established scientific facts and chemical reactions, Wikipedia is a decent source. I just searched Wikipedia for Denitrification and I got an answer very quickly.

Ralph Said:

What is Energy produced by atomic reactions?

We Answered:

Energy created in a nuclear reaction is called nuclear energy, or atomic energy.

Energy from sunlight is stored as chemical energy in wood and other organic material, using a process called photosynthesis. This energy is released as heat when wood is burned.

Geothermal energy is produced by heat beneath earth's surface.

It is wind energy that turns a windmill, which pumps water or produces electricity.

gasohol, sometimes called ,E10 is a fuel mixture of 10% anhydrous ethanol and 90% gasoline that can be used in the internal combustion engines of most modern automobiles and light-duty vehicles without need for any modification on the engine or fuel system.

Waste also referred to as rubbish, trash, refuse, garbage, or junk is unwanted or unusable materials.

Hydroelectricity is electricity generated by hydropower, i.e., the production of electrical power through the use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy. Once a hydroelectric complex is constructed, the project produces no direct waste, and has a considerably lower output level of the greenhouse gas carbon dioxide (CO2) than fossil fuel powered energy plants.

Geothermal power (from the Greek roots geo, meaning earth, and thermos, meaning heat) is power extracted from heat stored in the earth. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface.

Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on earth. Only a minuscule fraction of the available solar energy is used.

Biomass, a renewable energy source, is biological material derived from living, or recently living organisms, such as wood, waste, and alcohol fuels. Biomass is commonly plant matter grown to generate electricity or produce heat. For example, forest residues (such as dead trees, branches and tree stumps), yard clippings, wood chips and garbage may be used as biomass. However, biomass also includes plant or animal matter used for production of fibers or chemicals. Biomass may also include biodegradable wastes that can be burnt as fuel. It excludes organic materials such as fossil fuels which have been transformed by geological processes into substances such as coal or petroleum.

Wind is the flow of gases on a large scale. On Earth, wind consists of the bulk movement of air. In outer space, solar wind is the movement of gases or charged particles from the sun through space, while planetary wind is the outgassing of light chemical elements from a planet's atmosphere into space.

Alfred Said:

Hydrogen, Solar, natural gas, hydroelectricity ?

We Answered:

Hydrogen is used in fuel cells
Solar is from the sun
Natural gas is not renewable
Hydroelectricity comes from rivers

Heather Said:

please help me with energy?

We Answered:

Energy = work = force x distance . That will help you solve some of these. For instance, if a weight of 7 newtons is lifted 3 meters, it has the potential energy of 21 Newton-meters, or 21 Joules.

For kinetic (motion) energy, use Energy = 1/2 * mass * velocity^2

Audrey Said:

My sister is having a hard time in science, how can she memorize it?

We Answered:

I hate memorizing science especially, you should learn how to think in science class. But, that ain't how things work. We do need to just remember stuff for the test.

So, remember that the first two pairs are same letter pairs. M,M,S,S.

And the next 4 spell my name. LECH. I'm a Viking if you must know.

Lori Said:

help with my renewable energy poster?

We Answered:

Clean energy - energy whose production doesn't contribute to pollution or global warming

Renewable energy - energy derived from sources which can be fully replenished indefinitely (for the life of our planet) using environmentally sustainable processes

Why good? - because it provides a sustainable pathway to the future

Wind power - intermittent, highly variable, easily harnessed using high turbines, fully renewable and sustainable, "clean"
Solar power - 50% maximum availability, highly variable, easily harnessed using photovoltaic or thermal collectors, fully renewable and sustainable, "clean"
Bio fuel power - partially renewable but not fully sustainable (may produce net CO2 emissions, may compete with food production), not "clean"

Slogan: For a renewable energy poster, why not "Renewable Energy for a Sustainable World" ?