What makes the North Star, Polaris, special?
A) It is the brightest star in the sky.
B) It is the star straight overhead.
C) It appears very near the north celestial pole.
D) It is the star directly on your northern horizon.
E) It can be used to determine your longitude on Earth.
C
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What is meant by system properties?
What will be an ideal response?
Density: A styrofoam sphere of radius R has a density ?. You now carefully compress the sphere so its radius is R/2. What is the density of the compressed sphere?
A. 2 ?
B. 4 ?
C. ?
D. ?
E. 8 ?
Name two observable consequences of the Earth's tidal pull on the Moon
What will be an ideal response?
The ancient Greeks, including Ptolemy, thought that the stars were
A) scattered everywhere between the moon and the inside surface of a large sphere that enclosed the universe. B) scattered throughout infinite space. C) alive. D) scattered everywhere between Earth and the moon. E) fixed to the inside surface of a large sphere that enclosed the universe.