The ancient Greek physicist mathematician famously said what is the fulcrum lever theory?

Brief description of the principle of leverage: the system that satisfies the following three points is basically leverage: fulcrum, force point, and force point.

The principle of leverage is also known as the "lever equilibrium condition": for a lever to be balanced, the two moments acting on the lever (the product of the force and the arm of the force) must be of equal magnitude. Namely:

Power Power Arm = Resistance Resistance Arm, expressed algebraically as f1·

l1=f2·l2。where F1 represents the power, L1 represents the power arm, F2 represents the resistance, and L2 represents the resistance arm. From the above formula, it can be seen that in order to balance the lever, the power arm is several times that of the resistance arm, and the power is a fraction of the resistance.

King Havelon was confronted with another thorny problem: the king had built a ship for the king of Egypt, but it was too big and heavy to fit into the sea, so the king said to Archimedes: "You can lift even the earth, and it should be fine to put a ship in the sea, right?"

So Archimedes immediately skillfully combined all kinds of machinery to build an apparatus, and when everything was ready, he handed over the rope that would pull the apparatus to the king, and the king gently pulled it, and the great ship moved and launched, and the king had to be impressed by Archimedes' genius. From this historical story, we can understand that Archimedes was probably the person who had the most thorough understanding of the principles and applications of machinery in the world at that time.

Archimedes' study of mechanics began when he was a student in Alexandria. One day, while walking along the arid Nile, Archimedes saw that the peasants had a lot of trouble carrying water for water, and after thinking about it, he invented a way to rotate the water in a water pipe by using a spiral action.

The tool that was sucked up, and later generations called it "Archimedes Spiral Water Lifter", and Egypt still used this instrument until modern times 2,000 years later. This tool became the ancestor of the later screw thruster. In Europe at that time, simple machines were often used in engineering and daily life, such as:

Screws, pulleys, levers, gears, etc., Archimedes spent a lot of time researching, and discovered the concept of "lever principle" and "torque", for Archimedes, who often used tools to make machinery, it was easy to apply the theory to practical life. He himself once said, "Give me a fulcrum and a lever long enough, and I can pry the whole earth." ”

Archimedes , he famously said "Give me a fulcrum, and I can pry the earth".

Solution: The Earth's gravity is the drag force.

g=mg=available according to the leverage equilibrium condition.

f×l1=g×l2

600n L1 = then: L1

l2 600n

The power arm is 1 1023 times that of the resistance arm.

And because: l1

l2 s1s2 s2=1cm=

So: s1

l1 l2s2＝ 1×1023 ×

Because: 1 light year = 3 108m s (365 12 30 24 3600s) =

Archimedes is a great ancient Greek philosopher, encyclopedic scientist, mathematician, physicist, mechanic, founder of static mechanics and hydrostatics, and enjoys the reputation of "the father of mechanics", Archimedes discovered the principle of lever and the law of buoyancy, "give me a fulcrum, I will pry the whole earth" is an exaggeration of Archimedes' principle of leverage

Therefore, choose B

1) "Give me a fulcrum, and I can pry the earth" is a bold saying of the ancient Greek physicist Acardine Ruhaimede; Archimedes' equilibrium condition for leverage, also known as the principle of leverage;

2) The first scientist in history to measure the value of atmospheric pressure was Galileus's student Torricali, and later this famous experiment was named after him, called the Torricelli experiment

So the answer is: Archimedes; Torricelli

Archimedes, give me a lever and I can pry the whole earth.

Oh, yes. The ancient Greek scientist Archimedes famously said, "If you give me a fulcrum, I can move the earth!" ”

Archimedes was the first to propose the principle of leverage in his book "On the Equilibrium of Plane Figures". He first regarded some empirical knowledge in the practical application of levers as "self-evident axioms", and then proceeded from these axioms and used geometry to derive the principle of levers through rigorous logical argumentation.