A reasonable estimate for the height of an ordinary adult male is
A) 50 cm.
B) 70 cm.
C) 200 cm.
D) 300 cm.
C
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If a star with an absolute magnitude of ?5 has an apparent magnitude of +5, then its distance is
a. 1 pc. b. 10 pc. c. 100 pc. d. 1000 pc. e. 10,000 pc.
For which of the following is the celestial sphere an accurate representation of reality?
A. the view of the stars from Earth B. the motion of the planets around Earth C. the spherical bubble that surrounds Earth D. the distance to the stars E. the motion of the Sun around Earth
What is the similarity between burning and respiration?
A) Both reactions consume energy. B) Both reactions involve the combination of carbon with oxygen. C) Both reactions create oxygen. D) Both reactions consume glucose. E) Actually there is no similarity between them.
In which of the following processes does the system's total mass change?
A) An automobile speeds up. B) A rubber ball is squeezed. C) The total mass changes in both of the above processes. D) The total mass changed in neither of the above processes.