Besides direct formation of a black hole in a hypernova, some think that mergers between neutron stars can create even longer-lived gamma ray bursts as well
Indicate whether the statement is true or false
FALSE
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Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. B) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. C) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit. D) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists.
A bullet is fired from ground level with a speed of 150 m/s at an angle 30.0° above the horizontal at a location where g = 10.0 m/s2. What is the horizontal component of its velocity when it is at the highest point of its trajectory?
A) 0 m/s B) 10 m/s C) 75.0 m/s D) 130 m/s E) 150 m/s
A Carnot refrigerator has a coefficient of performance of 2.5. The refrigerator consumes 50 W of power. How much heat is removed from the interior of the refrigerator in 1 hour?
A) 720 kJ B) 180 kJ C) 450 kJ D) 7.5 kJ E) 72 kJ
The tidal streams mapped in the Halo are similar to ________ in our solar system
A) the asteroid belt between Mars and Jupiter B) the moons orbiting planets C) meteor swarms in old comet orbits D) the solar wind E) the rings around the jovians