The condition of ____________________ means that the force due to gravity pushing down on a layer is exactly equal to the pressure pushing outward on that layer
Fill in the blank(s) with correct word
hydrostatic equilibrium
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A mouse is running away from a cat at 0.75 m/s and, at 1.25 m from his mouse hole, he accelerates at a constant rate until he reaches his hole safely, 0.75 s later. What acceleration did he undergo during the final 1.25 m of his escape?
A. 1.8 
B. 1.2
C. 4.8
D. 2.4
E. 6.4
What problem does adaptive optics correct?
A) Defects in the optics of the telescope, such as the original Hubble mirror B) The opacity of the Earth's atmosphere to some wavelengths of light C) The light pollution of urban areas D) Turbulence in the Earth's atmosphere which creates twinkling E) Chromatic aberration due to use of only a single lens objective
The quasar epoch ended when the galactic merger rate ________
Fill in the blank(s) with correct word
Areas near a cold ocean or other cold body of water often experience a 'sea breeze' during the late morning, particularly on warm, sunny days. The process of energy transfer most directly associated with the development of the sea breeze is
1.conduction. 2.convection. 3.radiation. 4.none of these.