Who established the fundamental ideas of modern celestial mechanics based upon observations?
Correct answer: D. Both a & b
- A. Kepler
- B. Galelio
- C. Gilbert
- D. Both a & b
Explanation
Kepler was primarily a theoretician, whereas Galileo was primarily an observer. The principal similarity is that both made major contributions to the establishment of the heliocentric model of the solar system - Galileo by making discoveries which were much easier to understand in a heliocentric context, and Kepler by demonstrating that heliocentric (well, heliofocal) elliptical orbits described planetary motions much better than any other model.
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Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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