Very accurate measurements of stellar brightnesses and sudden changes are made with a ________
Fill in the blank(s) with correct word
photometer.
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Has Polaris always been the "North Star" , also known as the "Pole Star" ?
a. No, because the Earth's axis slowly changes the direction it points. b. No, because it is a young star which formed only a few hundred years ago. c. Yes, because stars position change little over many centuries. d. No, because the Milky Way blocked our line of site to it for a long time.
What aspect of Kepler's theory would have horrified all astronomers before Kepler?
A) Kepler's elliptical orbits. B) The fact that the Earth has a spherical shape in Kepler's theory. C) Kepler's simple circular orbits. D) The fact that Earth was no longer at the center. E) The absence of any epicycles [or "circles-within-circles"].
Where would you most likely find a large radio telescope?
a. in a busy, populated area b. at the peak of a mountain c. on top of a tall building d. in a mountain valley e. near multiple radio towers
An ideal incompressible fluid flows at 12 m/s in a horizontal pipe. If the pipe widens to twice its original radius, what is the flow speed in the wider section?
A) 12 m/s B) 6.0 m/s C) 4.0 m/s D) 3.0 m/s