A light bulb is connected to a 110-V source. What is the resistance of this bulb if it is a 100-W bulb?
A) 100 ?
B) 8.0 m?
C) 6.0 m?
D) 120 ?
E) 240 ?
D
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The most significant difference between the astronomical theories of Ptolemy and Copernicus is
A) Ptolemy's is not based on scientific evidence, while Copernicus's is. B) Ptolemy's theory does away with many of the complexities of the Copernican theory. C) Ptolemy's theory is sun-centered, whereas Copernicus's is Earth-centered. D) Ptolemy uses circular planetary orbits while Copernicus uses elliptical orbits. E) Ptolemy's theory is Earth-centered, whereas Copernicus's is sun-centered.
Proper motion of a star is measured in meters
Indicate whether the statement is true or false
Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of more than 3 million solar masses. C) It is a source of bright radio emission. D) It is a source of X-ray emission that we have observed with telescopes in space.
Low levels of ionizing radiation
a. are dangerous to the human body. b. can be tolerated by the human body. c. are beneficial to the human body. d. none of the above