When a solid changes to a liquid and then to a gas, energy is
1) released,
2) absorbed,
and when gas changes to liquid and then to solid, energy is
3) released.
4) absorbed.
Answer: 2, 3
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Biologists have found that life on Earth can
A) survive over a wide range of environmental conditions B) only survive on the surface of the Earth C) survive over only a very narrow range of environmental conditions D) survive only in the presence of sunlight
Refer to the diagram of Racetrack X. 
This special racetrack is all curve and no straightaway. If a driver takes her car around this track counterclockwise and at constant speed, then greater acceleration will occur at any place the turning radius is
A. larger. B. inward. C. outward. D. smaller.
What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of –16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C
The type of binaries where we can find their sizes have their orbits almost ________ as seen from the Earth
Fill in the blank(s) with correct word