It took two centuries for the Copernican model to replaced the Ptolemaic model because
A) in Copernicus' time, there were no telescopes.
B) the Church wouldn't let anyone talk about Copernicus' model for 200 years.
C) there was no scientific evidence to support either model until Galileo made his observations.
D) the Ptolemaic model was simpler and more aesthetically pleasing.
E) the Copernican model required complicated new terms to explain it correctly.
C
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Radiation: A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75, at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. (? = 5.67 × 10-8 W/m2 ? K4)
A. 360 W B. 760 W C. 790 W D. 850 W E. 880 W
Compared to ultraviolet waves, the wavelength of infrared waves is
A) shorter. B) the same. C) longer.
The Andromeda Galaxy (M31) is what type?
a. Spiral b. Irregular c. Elliptical d. Regular spiral
If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?
a. 9.80 m/s2 b. 7.35 m/s2 c. 4.90 m/s2 d. 2.45 m/s2 e. More information is needed to answer this question.