The solar wind blew light, gaseous elements out of the inner Solar System.
a. true
b. false
a. true
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Why do the patterns of the stars in our sky look the same from year to year?
A) because the stars in the constellations are so far away B) because the stars in the constellations are not moving C) because the stars in the constellations all move at the same speeds and in the same directions, so they don't change their relative positions D) because the stars in the constellations typically move so slowly – typically about the speed of a snail – that their motions are not noticeable
Lasers are used
a. to produce holograms. b. in surgery. c. to measure distances between objects accurately. d. in DVD and compact disc players. e. all of the above
A car coasts down a road into a valley and then coasts back up the next hill some distance
Where has its change in velocity been greatest? At the point at which it stops while going uphill? At the bottom of the hill? As it rolls back through the bottom to the other side? Explain.
Two concentric imaginary spherical surfaces of radius R and 2R, respectively, surround a positive point charge Q located at the center of the surfaces. When compared to the electric flux ?1 through the surface of radius R, the electric flux ?2 through the surface of radius 2R is
a.
.
b.
.