If the number of turns is tripled for an inductor of fixed length and fixed cross-sectional area, what happens to its inductance?
A. it stays the same
B. it triples
C. it becomes 9 times the original value
D. it decreases by a factor of 3
E. it decreases by a factor of 9
C. it becomes 9 times the original value
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By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding.
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies were born at the same time, and all will die at the same time. C) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. D) All galaxies outside the Local Group are orbiting the Local Group. E) Galaxies are in motion throughout the universe, with about equal numbers moving toward us and away from us.
Saturn has fewer, but stronger winds than Jupiter
a. True b. False Indicate whether the statement is true or false
What is the formula of a compound formed from the ions M2+ and X3-?
a. MX b. M3X2 c. M2X3 d. M6X6
Suppose you read somewhere that 10 percent of the matter in the Milky Way is in the form of dust grains. Should you be surprised? If so, why?
A) Given how easily dust grains can form, 10 percent is a surprisingly low fraction. B) The fraction of 10 percent is surprisingly high because dust grains can form only at low temperatures. C) There is nothing surprising about the 10 percent figure because dust grains are the material from which stars are born. D) The fraction of 10 percent cannot be correct. Dust grains are solid and only 2 percent of the matter in the galaxy is made of anything besides hydrogen and helium.