The Cosmological Principle states that
A. the Universe began as a hot violent event.
B. the expansion of the Universe is speeding up.
C. there is not a preferred location in the Universe.
D. the laws of physics apply everywhere in the Universe.
E. the Universe will continue to expand forever.
Answer: C
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The Doppler technique only provides a measure of the minimum mass of a planet because
A) only a small part of the planet's motion is measured. B) without a transit observation, the size and therefore density of the planet is unknown. C) we do not know the exact composition of the planet. D) only the motion of star toward the observer is measured, not the full motion. E) we do not have the technology to make a direct image of a planet yet.
If you were to unscrew bulb B from its socket (effectively removing it from the circuit and leaving a gap in its place), bulb A would
A. get brighter.
B. become dimmer.
C. remain at the same brightness.
D. go out.
What is the Physics Primer?
A. A set of mathematics topics that are relevant to introductory physics courses. B. A list of the most important formulas used in introductory physics courses. C. A detailed explanation of all of the mathematics you will use in your introductory physics course. D.A tutorial of the most important physics concepts covered in introductory physics courses
A beam of electrons is employed in
A) a gold-foil experiment. B) a cathode-ray tube. C) a LED television screen. D) an oil-drop experiment.