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none really, he was more of an author, its his writings that caused a greater contribution. He did study specialising in cataracts. but cured nothibng

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16y ago

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What kind of energy does a toaster use?

answer: kinetic energy :D ari and tas and wad


What objects have matter?

alot of objects have matter like the following: gas, water, hair, the sun, air. and sunshine doesnt have matter. air has matter because if you put an upside-down cup with a wad of paper in the bottom and you stick it in the water upside-down and when you take it out if you did it right then the paper is dry so that proves that air has matter


Where did Charles Darwin studied?

Darwin first went to the university of Edinburgh to study medicine but he didn't like the sight of blood. He then moved to Christ's College, Cambridge to study to become a preist. He didn't finish the course.


If you fold a piece of paper 50 times how thick would it be?

It depends, because the paper could be thicker than others.AnswerThe folded paper would be 1 x (250) times as thick as the original sheet as each fold doubles the thicknessAssuming the initial paper is 1/100 of an inch thick the last fold would make a wad of paper almost 200 million miles thick


Why do soundwaves travel faster through solids?

There are two things that come into play here: elastic properties and inertial properties. Both affect propagation velocity to varying degrees. Elastic propertiesinvolve a substance's ability or tendency to return to its original shape when forces of deformation are removed. Highly elastic substances will snap back to their original shape when the deformation forces are removed. A rubber band is an example of a highly elastic object. A wad of silly putty, on the other hand, is not very elastic. (It is very plastic.) A steel girder is also highly elastic; it will flex when deformation forces are applied, and it will return to its original shape when they are removed. But steel is one thing that a rubber band is not: it's rigid. Whereas a rubber band will flex, bend, or stretch after applying very little force to it, a steel girder will greatly resist any deformation force applied to it. In general, the more rigid and elastic the substance, the faster the propagation of sound through it. Hence, a hunk of steel will have a higher propagation velocity than a hunk of silly putty. Inertial properties involve a substance's mass density. The greater the density, the slower the propagation velocity, which is why sound waves will travel much faster through, say, helium, than through air. Which provokes the question: If substances with lower density have higher propagation velocities than substances with greater density, why do solids have higher propagation velocities than liquids, which have higher propagation velocities than gases? The reason is the elastic properties of solids play a greater role than the inertial ones, and solids are generally more elastic and rigid than liquids and gases. Since liquids and gases are inelastic and non-rigid, the mass density is the key property that affects propagation velocity through them.