The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center
b. the Copernican system used elliptical planetary orbits
c. the Copernican system used uniform circular motion
d. the Copernican system assumed all planets orbited the Sun
c
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Momentum: A proton, which has a mass of 1.67 × 10-27, is moving at 0.80c relative to the laboratory. What does a physicist in that lab measure for its momentum? (c = 3.0 × 108 m/s)
A. 4.0 × 10-19 kg ? m/s B. 4.4 × 10-19 kg ? m/s C. 5.0 × 10-19 kg ? m/s D. 5.8 × 10-19 kg ? m/s E. 6.7 × 10-19 kg ? m/s
The Earth intercepts 1.27 × 10^17 W of radiant energy from the Sun. Suppose the Earth, of volume 1.08 × 10^21 m3, was composed of water. How long would it take for the Earth at 0°C to reach 100°C, if none of the energy was radiated or reflected back out into space?
a. 26.9 y b. 113 y c. 2.69 × 10^4 y d. 1.13 × 10^5 y e. 2.69 × 10^7 y
Einstein's special relativity is based upon two postulates. The most radical of the two postulates states that
A. the classical velocity addition formula still holds at relativistic speeds. B. there is no ether surrounding the Earth. C. the speed of light is finite. D. the speed of light is the same for all observers in all inertial reference frames.
Recycling costs energy as well as time
What will be an ideal response?