An epicycle was used in geocentric models to explain ________.
A. Earth's circular shadow
B. parallax
C. retrograde motion
D. eclipses
E. aurora
Answer: C
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Part of the current atmosphere of Earth is believed to be
a. the remnants of the original hydrogen and helium gas from the solar nebula attracted by the protoplanet. b. the result of the melting and vaporizing of the glaciers from the last ice age. c. composed primarily of hydrogen and helium. d. composed of gases that were outgassed from the heated rocks sometime after the planet formed. e. the result of a collision between the sun and another star.
Dark lines in an absorption spectrum represent:
a) particular energies of light coming from a distant object that areabsorbed by materialin between. b) flaws in the telescopes and spectroscopes that astronomers use to measure spectra. c) hotter regions in the object that is emitting the spectrum. d) regions where light travels more slowly and is not able to reach us. e) photons emitted when an electron jumps from a higher to a lower energy level.
What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation?
a. His conclusion that the same laws applied to all heavenly bodies, not just the Earth and the Moon. b. His conclusion that the same laws applied to all objects, no matter how small. c. His conclusion that planets move in elliptical orbits around the Sun. d. His connection of gravitation to his first law. e. His connection of gravitation to Kepler's observations of planetary movement.
A. +x direction B. -x direction C. +y direction D. -y direction E. +z direction F. -z direction T. The field is zero.