When you see the bright flash of a meteor, what are you actually seeing?
A) a star that has suddenly shot across the sky
B) a bright star moving quickly past our solar system
C) emission of visible light from a particle that has not yet entered Earth's atmosphere
D) the flash that occurs when a speeding rock from space hits the ground
E) the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere
E) the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere
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What key observations forced scientists to change their views about the location of the Sun within the Milky Way?
What will be an ideal response?
Our Sun will fade in luminosity as its supply of hydrogen drops in a billion years
Indicate whether the statement is true or false
A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a ?3.0-nC charge is placed on a corner diagonally away from the first charge. What is the magnitude of the electric field at either of the two unoccupied corners?
a. 20 N/C b. 14 N/C c. 4.0 N/C d. 12 N/C e. 8.0 N/C
Which of the following is true of a light-year(ly)?
A) It is a unit of time. B) It is a unit of mass. C) It is a smaller unit of distance than kilometers. D) It is a larger unit of distance than the astronomical unit.