What is Archimedes: Definition and 211 Discussions

Archimedes of Syracuse (; Ancient Greek: Ἀρχιμήδης; Doric Greek: [ar.kʰi.mɛː.dɛ̂ːs]; c. 287 – c. 212 BC) was a Greek mathematician, physicist, engineer, inventor, and astronomer. Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity. Considered to be the greatest mathematician of ancient history, and one of the greatest of all time, Archimedes anticipated modern calculus and analysis by applying the concept of the infinitely small and the method of exhaustion to derive and rigorously prove a range of geometrical theorems, including: the area of a circle; the surface area and volume of a sphere; area of an ellipse; the area under a parabola; the volume of a segment of a paraboloid of revolution; the volume of a segment of a hyperboloid of revolution; and the area of a spiral.His other mathematical achievements include deriving an accurate approximation of pi; defining and investigating the spiral that now bears his name; and devising a system using exponentiation for expressing very large numbers. He was also one of the first to apply mathematics to physical phenomena, founding hydrostatics and statics, including an explanation of the principle of the lever. He is credited with designing innovative machines, such as his screw pump, compound pulleys, and defensive war machines to protect his native Syracuse from invasion.
Archimedes died during the siege of Syracuse, where he was killed by a Roman soldier despite orders that he should not be harmed. Cicero describes visiting the tomb of Archimedes, which was surmounted by a sphere and a cylinder, which Archimedes had requested be placed on his tomb to represent his mathematical discoveries.
Unlike his inventions, the mathematical writings of Archimedes were little known in antiquity. Mathematicians from Alexandria read and quoted him, but the first comprehensive compilation was not made until c. 530 AD by Isidore of Miletus in Byzantine Constantinople, while commentaries on the works of Archimedes written by Eutocius in the 6th century AD opened them to wider readership for the first time. The relatively few copies of Archimedes' written work that survived through the Middle Ages were an influential source of ideas for scientists during the Renaissance and again in the 17th century, while the discovery in 1906 of previously unknown works by Archimedes in the Archimedes Palimpsest has provided new insights into how he obtained mathematical results.

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  1. S

    Buoyancy and Archimedes' Principle

    If an object floats in water, its density can be determined by tying a sinker on it so that both the object and sinker are submerged. Show that the specific gravity, (Density_substance)/(density_water at 4 degrees), is given by (w)/(w_1 - w_2), where w is the object's weight in air alone, w_1 is...
  2. S

    Finding Tension in a Submerged Ball Using Archimedes' Principle

    A ball of mass m_b and volume V is lowered on a string into a fluid of density p_f . Assume that the object would sink to the bottom if it were not supported by the string. What is the tension T in the string when the ball is fully submerged but not touching the bottom? Express your answer (T)...
  3. N

    Calculating Volume Using Archimedes' Principle

    An object is solid throuhgout. When the object is completely submerged in ethyl alcohol, its apparent weight is 15.2N. When completely submerged in water, its apparent weight is 13.7N. What is the volume of the object? This is my attempt: Weight of object in ethyl alcohol [Woe]= (density...
  4. A

    Explaining Archimedes Principle to Kids 9-10

    How would I best explain Archimedes Principle to kids 9-10? So they can understand it? I don't need any experiments, All I want is an easy explination on what it is and how it works so 10 year old kids can understand. And in the shortest amount of words...
  5. J

    Calculating the Density of Wood with Archimedes' Question

    A wooden cylinder 30.0 cm high floats vertically in a tub of water (density 1.00 g/cm^3). The top of the cylinder is 14.1 cm above the surface of the liquid. What is the density of the wood? Does the radius of the cylinder need to be known in order to relate height and volume? Obviously...
  6. C

    How does Archimedes' Principle prove buoyancy?

    Ok, I've seen many proofs of this, all being the same, but the closest I could find online was here: http://freespace.virgin.net/mark.davidson3/IMS2121/buoyancy/Buoyancy.html Basically the idea is you mess around with the formulas for pressure and hey bingo. However, I have one question - the...
  7. D

    Physics starts with Archimedes

    With the law of lever!
  8. tandoorichicken

    Archimedes principle and wooden block

    A wooden block 20 * 20 *10 cm^3 has a density of .6 g/ cm^3 (a) How much iron (density = 7.86 g/cm^3) can be placed on to p of the block if the top of the block is to be level with the water around it? (b) If iron were attached to the bottom of the block instead, what mass of iron would it...
  9. tandoorichicken

    Solving Archimedes' Problem: Is the Crown Gold?

    A king's crown is said to be solid gold but may be made of lead and covered with gold. When it is weighed in air, the scale reads .475 kg. When it is submerged in water, the scale reads .437 kg. (a) is it solid gold? (b) if not, what percentage by mass is gold? density of gold = 19.3 * 10^3...
  10. J

    Archimedes and Calculus: A Lost Connection?

    Newton and Leibniz are generally credited with the invention of calculus, aren't they? Last night I saw on TV that Archimedes actually knew some basic concept of calculus but his description of it was "lost" to the world until a recent "re-discovery." What do you think the history of...
  11. Z

    Question about Archimedes Principal

    Hi everyone, im having some difficulties with a certain homework problem I'm on. Up until now I've solved all buoyancy problems knowing its weight in air and its weight submerged in a liquid (generally water). In this particular problem, it gives the weight of the block completely...
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