Sagittarius A* has a mass of _____
A) 3 million Earth masses
B) 4 million solar masses
C) 5 million Earth masses
D) 6 million solar masses
B
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First Law of Thermodynamics: A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9.0 kJ of heat is applied to the system and it does 5.0 kJ of work, how much does the internal (thermal) energy of the fluid change?
A. 4.0 kJ B. 14 kJ C. -4.0 kJ D. 45 kJ
What buoyant force is exerted by water on a 0.60-kg solid gold crown when it is immersed in water? The density of gold is 19.3 × 103 kg/m3 and that of water is 1000 kg/m3
A) 3.0 × 10-5 N B) 3.0 × 10-4 N C) 3.0 × 10-2 N D) 0.30 N
If the universe had ________, that would resolve Olbers' paradox.
A. more electromagnetic radiation than mass B. sources of new matter, like white holes C. an infinite age D. an edge in space E. more mass than electromagnetic radiation
Humans have not sent a spacecraft into the interior of the Sun to confirm any models of the interior. What evidence then do we have to support our current ideas about the solar interior?
A) solar neutrinos B) solar flares C) sun spots D) X-ray observations that penetrate the gas E) We have no evidence, just informed guesses.