Why was Copernicus' model much simpler than Ptolemy's?
What will be an ideal response?
To duplicate retrograde motion, Copernicus merely had the planets lapping each other as they revolved around the Sun at varying speeds. Ptolemy needed a complex set of deferents and epicycles to explain retrograde motion in his geocentric model.
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Impulse: A 0.140 kg baseball is thrown horizontally with a velocity of 28.9 m/s. It is struck with a constant horizontal force that lasts for 1.85 ms, which results in a velocity of 37.0 m/s in the opposite direction. What was the magnitude of the horizontal force?
A. 0.613 kN B. 2.19 kN C. 2.80 kN D. 4.99 kN
On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2. At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3
(a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X? What will be an ideal response?
At what frequency should a 200-turn, flat coil of cross sectional area of 300 cm2 be rotated in a uniform 30-mT magnetic field to have a maximum value of the induced emf equal to 8.0 V?
A. 7.5 Hz B. 7.1 Hz C. 8.0 Hz D. 8.4 Hz E. 16 Hz
How does emission of long wavelength radio radiation from neutral hydrogen help us overcome the shortcomings of visible light in mapping out distant parts of our galaxy?
What will be an ideal response?