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A star's absolute magnitude is equivalent to the apparent magnitude that a star would have at a distance of _____ parsecs from the Sun. A. 1 B. 10 C. 100 D. 1,000
Weegy: A star's absolute magnitude is equivalent to the apparent magnitude that a star would have at a distance of B. 10 parsecs from the Sun. Therefore the answer is B. 10 (More)
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Asked 3/27/2013 11:52:26 PM
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If you moved closer and closer to a star, how would its apparent magnitude change? A. It would increase. B. It would decrease. C. It would remain the same.
Weegy: A. It would increase. User: The stars with the coolest surface temperature fall into which spectral class? A. A B. B C. G D. K E. M F. O Weegy: The stars with the coolest surface temperature fall into E. M class. User: Which statement about luminosity is NOT true? A. It is commonly measured in watts. B. It is valued at 1 for our Sun. C. It stands for the total energy output of a star. D. It increases from top to bottom on an H-R diagram. Weegy: The answer is D User: What does M represent in the equation below? m = M + 5 log(d/10) A. luminosity B. spectral class C. absolute magnitude D. apparent magnitude Weegy: C. It would remain the same. (More)
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Asked 3/27/2013 11:59:21 PM
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Which spectral class does the Sun belong to? A. A B. B C. G D. K E. M F. O User: The Sun's surface temperature is closest to _____. A. 3,500 K B. 6,000 K C. 11,000 K D. 30,000 K
Weegy: B. 6,000. The Sun's surface temperature. User: If you moved closer and closer to a star, how would its absolute magnitude change? A. It would increase. B. It would decrease. C. It would remain the same. Weegy: If you moved closer and closer to a star, its absolute magnitude would C. remain the same. (More)
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Asked 3/27/2013 11:55:49 PM
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Which of these is a type of matter that rarely interacts with other matter and is created in some nuclear fusion reactions within stars? A. photon B. positron C. neutrino D. helium-4
Weegy: B. positron User: What exists just before nuclear fusion begins in the core of a ball of gas in space? A. a star B. a nebula C. a protostar D. a molecular cloud Weegy: A. star User: In a nuclear fusion reaction, the mass of the reactants is _____ the mass of the products. A. less than B. more than C. the same as Weegy: In nuclear fusion, a fraction of the mass is converted to energy, so the mass of the products is less than the combined mass of the reactants. Answer choice 1 is best. (More)
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Asked 3/28/2013 4:01:39 PM
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What keeps a red giant from collapsing under its own gravity? A. dark energy B. tightly packed neutrons C. tightly packed electrons D. the force provided by nuclear fusion
Weegy: A. gravity User: Which of the following lists the stars in order from greatest density to least density? A. white dwarf, neutron star, main sequence star, giant B. giant, main sequence star, white dwarf, neutron star C. white dwarf, neutron star, giant, main sequence star D. neutron star, white dwarf, main sequence star, giant User: A typical neutron star has more mass than _____ and is about the same size as _____. A. a city, Earth B. a city, the Sun C. Earth, the Sun D. the Sun, a city User: Where is the mass of a black hole located? A. at the singularity B. at the event horizon C. between the singularity and the event horizon D. The mass of a black hole cannot be located. User: Which observation most likely indicates the presence of a black hole? A. Nearby objects are undergoing a gravitational effect. B. There is a pitch-black region in space with nothing else around it. C. X-rays are emitted from a source and then quickly pulled back in again. D. A particular area is producing lots of radiation in all parts of the electromagnetic spectrum. Weegy: B. There is a pitch-black region in space with nothing else around it. User: Black holes must have a mass three or more times the mass of _____. A. Earth B. Jupiter C. Saturn D. the Sun Weegy: Everything that has mass has gravity. Even YOU have gravity, just a very small amount. Even Air has mass, and, thus, gravity. [ Right now, pressing down on you, is a column of air that weighs 14 pounds for each square inch of your body. Jupiter, being a gas giant, also has mass. Indeed, quite a bit of mass. Thus, it has gravity as well. ] User: Cygnus X-1 was the first _____ to be discovered. A. red giant B. black hole C. white dwarf D. neutron star E. main sequence star Weegy: Cygnus X-1 was the first B. black hole to be discovered (More)
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Asked 3/28/2013 7:24:20 PM
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Weegy: (a)5k^2(1 - 7k) is the answer. 5k^2(1 - 7k) = 5k^2 - 35k^3 User: Factor x 4 y 2 + x 3 y 3. Weegy: x+y=k is ...
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