A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
A) 1/32 B) 1/8 C) 1/2 D) 1/4 E) 1/16
E
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The rapid rotation of Uranus and its high inclination give the magnetosphere and its long extension a(n) _______________ shape
Fill in the blank(s) with correct word
Contrast the orbits of asteroids and Kuiper Belt bodies
What will be an ideal response?
An inventor has created a heat engine that extracts energy from geothermal hotspots and geysers like Old Faithful at Yellowstone National Park. She claims to turn all of the geothermal energy into work. Such a device is
A. a violation of the first law of thermodynamics. B. consistent with Clausius's statement of the second law of thermodynamics. C. a violation of Kelvin's statement of the second law of thermodynamics. D. only possible for a Carnot cycle.
In the context of main-sequence stars, which of the following statements is true of a mass-luminosity relation?
A) The main-sequence stars in a Hertzsprung-Russell diagram are not ordered according to their masses. B) The lowest-mass stars are the hottest and brightest main-sequence stars. C) It is followed by giants, supergiants, and white dwarfs. D) The more massive a star is, the more luminous it is.