What do astronomers mean by the Big Bang?
A) the event that marked the beginning of the expansion of the universe
B) a gigantic explosion that blew all the galaxies in the universe to smithereens
C) the explosion of a massive star at the end of its life
D) the event that marked the birth of our solar system
A
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Which moon is rich in organic molecules but too cold to support chemical evolution?
a. Europa b. Titan c. Enceladus d. Io e. Ganymede
Two charged particles held a certain distance apart are released. As they move, the acceleration of each decreases. Therefore, their charges have
A) the same sign. B) opposite signs. C) need more information
A child is riding a merry-go-round that has an instantaneous angular speed of 1.25 rad/s and an angular acceleration of 0.745 rad/s2. The child is standing 4.65 m from the center of the merry-go-round
What is the magnitude of the linear acceleration of the child? A) 8.05 m/s2 B) 7.27 m/s2 C) 2.58 m/s2 D) 3.46 m/s2 E) 4.10 m/s2
Free Fall: A ball is thrown straight up with a speed of 36 m/s. How long does it take to return to its starting point, assuming negligible air resistance?
A. 3.7 s B. 7.3 s C. 11 s D. 15 s