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May 7, 1542
Copernicus
Heliocentric model of the universe, sun in middle and earth and other planets rotate around it -
Kepler
laws of planetory motion
1) orbit of a planet is an ellipse with sun at one of two foci
2)line segment between planet and sun equal areas in equal amounts of time
3)square of orbital period is proportional to cube of semi major axis -
Galileo
law of pendulum- period of each swing is exactly the same
improved telescope -
Snell
law of refraction, used to describe the relationship between the angles of incidence and refraction. -
Hooke
hooke's law- force is proportioal to distance -
newton
laws of motion
1) action reaction
2) object in motion stays in motion
3) object at rest will stay at rest -
Benjamin Franklin
proved that lightning is electricity through his kite experiment -
Watt
Steam engine improvement, fundamental to industrial revolution -
Avogadro
Known for contributions to molecular theory and Avogadro's law -
Ampere
Created electrodynamics and the SI unit of electric current, interactions between electric charges and current -
Ohm
Ohm's law, current through conductor is directly proportional to potential difference -
Joule
Joule's first law, relationship between heat generated and current flowing -
Doppler
Created doppler effect, change in frequency -
Kelvin
absolute thermometric scale, equal absolute expansions of mass of air or gas under constant pressure should indicate equal differences of numbers on scale -
Hertz
proved the existence of electromagnetic waves -
Tesla
alternating current electricity system -
Einstein
general theory of relativity, geomettric theory of gravitation
