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Scientists
This category is for questions about the people who apply the scientific method to solve problems, introduce new concepts, and strive to explain the natural world.
9,527 Questions
What was Nikola Tesla contributions to society?
Tesla is often described as the most important scientist and inventor of the modern age. He is best known for many revolutionary contributions and inventions in the field of electricity and magnetism in the late 19th and early 20th centuries. Tesla's patents and theoretical work formed the basis of modern alternating current electric power (AC) systems, including the polyphase power distribution systems and the AC motor, with which he helped usher in the Second Industrial Revolution.
After his demonstration of wireless communication (radio) in 1894 and after being the victor in the "War of Currents" ( in the late 1880s, George Westinghouse and Thomas Edison became adversaries due to Edison's promotion of direct current (DC) for electric power distribution over alternating current (AC) advocated by Westinghouse and Nikola Tesla.), he was widely respected as one of the greatest electrical engineers who worked in America. Much of his early work pioneered modern electrical engineering and many of his discoveries were of groundbreaking importance. But due to his eccentric personality and his seemingly unbelievable and sometimes bizarre claims about possible scientific and technological developments, Tesla was ultimately ostracized and regarded as a mad scientist. Never having put much focus on his finances, Tesla died impoverished at the age of 86.
Aside from his work on electromagnetism and electromechanical engineering, Tesla has contributed in varying degrees to the establishment of robotics, remote control, radar and computer science, and to the expansion of ballistics, nuclear physics, and theoretical physics.
Many interpret the 1943 Supreme Court of the United States decision as crediting Tesla as being the inventor of the radio.
Nikola Tesla, at the 1893 World's Columbian Exposition in Chicago, demonstrated a device he constructed known as the "Egg of Columbus." It was used to demonstrate and explain the principles of the rotating magnetic field model and the induction motor. Tesla's Egg of Columbus performed the feat of Columbus with a copper egg in a rotating magnetic field. The egg spins on its major axis, standing on end due to gyroscopic action.
Tesla's device (two-phased induction motor) used a toroidal (doughnut shaped) iron core stator on which four coils were wound. The device was powered by a two-phase alternating current source (such as a variable speed alternator) to create the rotating magnetic field. The device operated on 25 to 300 hertz frequency. The ideal operating frequency was described as being between 35 to 40 hertz. Reproductions of the device are displayed at the Nikola Tesla Museum in Belgrade, the Technical Museum in Zagreb and in the Ann Arbor Hands-On Museum.
julian Trubin
Why did scientists reject Lamark's idea of evolution?
Lamarck led the way for and had ideas that helped Darwin. However, his observations regarding the mechanisms of evolution were, with the exception of one, totally backwards.
To summarize Lamarck, he hypothesized that organisms somehow had a choice in their traits and could change to fit the environment (he called these ideas his theories of need and his theory of use and disuse). The part he was correct on was that should an organism change, they would pass the traits on to their offspring.
Darwin said, basically, the opposite. Darwin observed that organisms were born with slight differences (variations) and those variations might give some members of a species an advantage in the struggle to survive in the environment. The reward for survival was that the organism got to reproduce and pass those traits on to their offspring. Of course, the offspring might show some variation and the whole process would continue to repeat.
However, the bottom line with Darwin (and contrary to Lamarck) was that an organism had no choice in its traits as an organism is born with or without the advantage. Darwin, without knowing its mechanisms, recognized that genetics played a part in evolution.
Darwin died not knowing of Mendel's work on genetics which, of course, substantiates Darwin's theory.
What limitations do scientists face for what topics or problems they can study in their work?
There are many limitations for the topics or problems scientists can study in their work. Here are just some limits:
- Ethics and ethical research must always guide and underpin research.
- Human Subjects requires a special Human Subjects Research Review committees before research can commence. This protects the human subjects.
- Animal Research also carries special ethics that govern the work.
- Sample size - Most research needs a good sample size (number of subjects) to be valid research.
- Repeatability - A scientist must show steps of their work so other scientists can perform the same steps-- good research and the outcome must be repeatable when other scientists perform the same work.
- Generalizing - Most scientific studies must seek to apply to a larger group or "all". Research on a few people or animals makes it specific only to them. It's called anecdotal, not research.
- Applicable - Must be applicable (apply to) a larger group and show how it is. Example: if you only study 5 people's risk for heart diseases, the results cannot apply to millions of people.
- Funding - no money, no research. The best grants allow longer (longitudinal) studies done over years, examples: AIDS, HIV, Cancer, Heart Disease.
Where would you go for work experience if you wanted to be a forensic scientist?
some people have said the work experience as a lab technician would give you enough experience, but I'm researching for an answer also as i would like to be a forensic scientist :D hope this helps you more than it did me :)
What are two ways that scientists make observations?
2 ways scientist make observations:
recording information in an experiment
examining something over time
How many times should a experiment be repeated before reaching a conclusion?
as much data as possible can be colleced in the time availble
What math guy invented adding math?
It was invented in prehistory and the identity of the person is not known.
Who are Nikola Tesla's grandparents?
Sofija Budisavljevic was his maternal grandmother
Nikola Teska was his paternal grandfather
What do scientistts think all living species decended from?
wat i really think is that scientis really dont know and that species come in different places and that is wata i really think thnk for u to ask me if i can answer it . < 3
What math did katherine A okikiolu invented?
She is known for her work with elliptical differential operators.
What procedure do scientist use to make new discoverues?
To make new discoveries, scientists use the Scientific Method: identify a problem, make a hypothesis, develop and execute an experiment, make observations, analyze the results.
Why has not scientists cataloged all living things?
There are constantly new species and things being found so it is almost impossible to have everything categorized.
Scientific Method
What was the scientist Darwin first name?
First of all Darwin was not a scientist. He was pastor on a field trip who tried to turn himself into a scientist, but he never conducted any scientific research or experiments. He merely drew conclusions from his observations. Which by the way have since all been proven wrong. His first name was Charles.
What is the name of the scientist who developed hundreds of products made from peanuts?
That great peanut scientist was named George Washington Carver.
What did Rutherford contribute to the study of science?
After Rutherford's discovery(Planetary Model), scientists started to realize that the atom is not ultimately a single particle, but is made up of far smaller subatomic particles. Following it research was done to figure out the exact atomic structure which led to Rutherford's gold foil experiment. They eventually discovered that atoms have a positively-charged nucleus in the center. Since electrons were found to be even smaller, this meant that the atom consists of mostly empty space.
Why do scientists prefer using Metric units rather than the English System?
the United States is the only place that still uses the English system. everywhere else uses the Metric. thus, it would make more sense to use the Metric system.
Actually, any sensible person prefers the metric units, since you don't have to carry a bunch of wildly different conversion factors around in your head... it's all based on multiples of ten, and lots of the units are related (for example, a liter is the volume of a cube 0.1 meters on a side). The only reason some people don't like them is because they don't know them, while they (think they) know the English units. Most of the time they really don't... most people are doing good if they can estimate a distance or weight of an unfamiliar object closer than a factor of two.
An additional advantage of the metric system (specifically, SI) is that it's the same everywhere. Word like "foot", "inch", "pound" and the like were used for different measurements in different countries, so for example an Imperial (i.e., UK) gallon is a different volume than a US gallon (it's larger by about 20%, so a US "quart" is about the same as an Imperial "fifth"); if you're dealing in international trade, understanding this can be very important. However, a liter is a liter everywhere.
Why do scientists prefer Metric units over the English System?
Apart from a couple of less advanced countries and (including?!) the US, all countries use the metric system. Since it is based on multiples of tens, calculations are simpler. Also, there are simpler links between measures for different attributes, for example between mass and volume.
