Can our Sun ever become a nova? Why?
What will be an ideal response?
No, ours is a single star, with no close companion to supply fresh hydrogen via mass transfer onto the surface of our collapsed white dwarf Sun billions of years from now.
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The diagram above represents energy levels in a hydrogen atom. Each level is labeled with its energy (above the ground state of Level 1) in units of electron/volts (eV). The labeled transitions represent an electron moving between energy levels. Which transition represents the electron that emits a photon with the highest energy?
A) A B) B C) C D) D E) E
The weight of a 1-centimer cubed metal cube scaled up by a factor of 10 will be
A) ten times as much. B) a hundred times as much. C) a thousand times as much. D) none of the above
An aluminum kettle (mass = 100 g) of pure water (mass = 60 g) is at room temperature (20°C). The kettle and its contents are placed on a 1000-Watt electric burner and heated to boiling
Assuming that all the heat from the burner heats the kettle and its contents and that a negligible amount of water evaporates before boiling begins, calculate the amount of time required to bring the water to a boil. A) 3.5 min B) 8.1 min C) 4.9 min D) 7.3 min E) 4.0 min
2.9×10^7 is the same as
a. 2.9 thousand. b. 29 thousand. c. 290 thousand. d. 2.9 million. e. 29 million.