Copernicus's heliocentric model failed to work as well as it might fail to predict the positions of planets because Copernicus insisted the orbits were
A. circular, mounted on epicycles.
B. circular.
C. elliptical.
D. hyperbolic.
Answer: B
Physics & Space Science
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A) sound interference. B) forced vibrations. C) re-echoed sound. D) resonance. E) none of the above
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State the principle of conservation of charge
What will be an ideal response?
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What is the highest frequency of the photons produced by a 29-kV x-ray machine? (h = 6.63 × 10^?34 J?s)
a. 4.4E+18 Hz b. 7.0E+15 Hz c. 4.4E+15 Hz d. 7.0E+18 Hz e. 3.1E+20 Hz
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Which of these is NOT a result of plate tectonics?
A) the Mid-Atlantic Rift B) the Philippine Trench C) the San Andreas Fault D) the Grand Canyon E) the Andes
Physics & Space Science