A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct? (There could be more than one correct choice.)
A) Its acceleration is constantly decreasing.
B) Its acceleration is constant.
C) Its acceleration is constantly increasing.
D) Its acceleration is zero.
E) Its acceleration is greater than g.
B
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What happens to the core of a star after a planetary nebula occurs?
A) It contracts from a protostar to a main-sequence star. B) It breaks apart in a violent explosion. C) It becomes a white dwarf. D) It becomes a neutron star. E) none of the above
Exoplanetary systems containing "hot Jupiters"—extremely massive planets orbiting very close to their parent stars—do not look like our own solar system. Are they inconsistent with the condensation theory of solar system formation? Explain
What will be an ideal response?
Decreasing the volume of the container holding an ideal gas:
a. decreases the gas pressure by slowing the gas particles. b. does not affect the gas pressure. c. increases the gas pressure by slowing the gas particles. d. increases the gas pressure because gas particles bounce off the walls of the container more often. e. increases the gas pressure because gas particles strike the walls of the container with more momentum on average.
___________ in other galaxies should contain luminous O and B stars if they are like the Milky Way
a. The halos b. The bulges c. The spiral arms d. The globular clusters e. The coronas