Until recently , how did archaeologist think that the Mayans spent most of their time?

Why was the airplane invented the time it did? Why not 10 years later?

Rufina [12.5K]

While many believe that the airplane was invented by the Wright brothers in Kitty Hawk, N.C., the first man to fly was New Zealander Richard Pearse in 1902, eight months before the Wright brothers first flew. Pearse, according to witnesses, flew a length of 50 to 400 yards in a heavier-than-air machine. Pearse's aircraft was the first to use proper ailerons, which allowed the wings to warp and turn the aircraft. Though many credit the invention of airplanes to the Wright brothers, Richard Pearse never reported his inventions because he didn't know there was any interest in flying.

Though the Wright brothers tested many gliders in the early 1900s, none of them counted as an actual aircraft, and the brothers didn't achieve flight until late 1903 with their first plane, the Flyer I. The craft weighed over 600 pounds, and Orville Wright was the first pilot. The craft remained airborne for 12 seconds and traveled a little over 120 feet.

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3 0

3 years ago

I need a paragraph or two Current research and technology of the biofuels

Alinara [238K]

Answer:

Explanation:

1- Biofuel is fuel that is produced through contemporary processes from biomass, rather than by the very slow geological processes involved in the formation of fossil fuels, such as oil. Since biomass technically can be used as a fuel directly (e.g. wood logs), some people use the terms biomass and biofuel interchangeably. More often than not, however, the word biomass simply denotes the biological raw material the fuel is made of, or some form of thermally/chemically altered solid end product, like torrefied pellets or briquettes.

2-the word biofuel is usually reserved for liquid or gaseous fuels, used for transportation. The U.S. Energy Information Administration (EIA) follows this naming practice.[1] Drop-in biofuels are functionally equivalent to petroleum fuels and fully compatible with the existing petroleum infrastructure.[2] They require no engine modification of the vehicle.[3]

6 0

2 years ago

In 2009, how many Americans sang in choirs?

Alexus [3.1K]

Throughout America, the number of participants in choirs has increased where more than 42.6 million individuals (both adults and children combined) are now considered to be part of some choral group.

There are more than 270,000 choral groups all across America (in 2009, as per the study). This participation is far more than any other performing arts.

1 in 6 Americans (above 18) sings in a chorus.

In 2009, the percentage has increased from 14% to 17%.

This information is taken from The Chorus Impact Study of 2009 which can be referred to for further details on Choral Singing and its impact on American life.

The study also examines the effect of choral singing on children and their development along with many other social aspects.

brainly.com/question/17640146

8 0

2 years ago

Please help me asap!

TiliK225 [7]

Answer: The 2nd choice

Explanation:

Overlapping claims by the French, the British, and the Spanish created fierce competition between the three European nations.

5 0

3 years ago

What are greece natural resources? What stuff does it have?

Alekssandra [29.7K]

Answer:

Greece has few natural resources. Its only substantial mineral deposits are of nonferrous metals, notably bauxite. The country also has small deposits of silver ore and marble, which are mined.

Explanation:

3 0

3 years ago