Nearly all of the objects that you can see in this photograph are
A) planets.
B) stars.
C) galaxies.
D) astronomical units.
C) galaxies.
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According to the second law of thermodynamics,
A) the total entropy of all the participants in any physical process cannot decrease. B) thermal energy flows spontaneously from hot objects to cold objects. C) energy process that uses thermal energy to do work must have a thermal energy exhaust. D) All of the above. E) None of the above.
A boat is traveling at 4.0 m/s as it passes the starting line of a race. If the boat accelerates at 2.0 
for 3.0 seconds, then the velocity the boat has after the 3.0 seconds is
A. 21 m/s. B. 9.0 m/s. C. 13 m/s. D. 10 m/s. E. 4.0 m/s.
Why are different spectral lines, such as helium, more visible in the corona than in the Sun's normal absorption spectrum?
What will be an ideal response?
In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter
Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2) A) 2.4 × 1019 kg B) 4.8 × 1019 kg C) 1.2 × 1020 kg D) 2.4 × 1020 kg E) 4.8 × 1020 kg