The supermassive black holes that may be powering active galaxies emit only synchrotron radiation
Indicate whether the statement is true or false
FALSE
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What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4 × 106 m, mass = 6.0 × 1024 kg) with a period of 5.0 h?
A. 88 N B. 55 N C. 36 N D. 98 N E. 18 N
A 100 gram glass container contains 200 grams of water and 50.0 grams of ice all at 0 src="https://sciemce.com/media/4/a6beff7b8db22a7632.png" class="w-image" />
A 200 gram piece of lead at 100
is added to the water and ice in the container. What is the final temperature of the system? (specific heat of ice = 2,000 J/kg
specific heat of water = 4,186 J/kg
heat of fusion of water = 333.7 kJ/kg, specific heat of glass = 837.2 J/km
specific heat of lead = 127.7 J/km
A. 5.33
B. 4.87
C. 3.65
D. 2.19
E. 1.75
What is the ultimate fate of an isolated white dwarf?
A) It will cool down and become gradually dimmer. B) As gravity overwhelms the electron degeneracy pressure, it will explode as a nova. C) As gravity overwhelms the electron degeneracy pressure, it will explode as a supernova. D) As gravity overwhelms the electron degeneracy pressure, it will become a neutron star. E) The electron degeneracy pressure will eventually overwhelm gravity and the white dwarf will slowly evaporate.
At present, what is the primary way that the search for extraterrestrial intelligence (SETI) is carried out?
A) by using radio telescopes to search for signals from extraterrestrial civilizations B) by analyzing high-resolution images of nearby stars in search of evidence for structures that could not have developed naturally C) by searching for planets around distant stars D) by using x-ray telescopes to search for exhaust from interstellar spacecraft E) by seeking access to the secret records and alien corpses kept at the military's Area 51 in Nevada