Why was a knowledge of the stars so important to Polynesians?
What will be an ideal response?
The Polynesian people live on a group of widely separated islands in the South Pacific. Knowledge of the stars allowed navigators to determine their latitude and direction, both essential for traveling the large distances from island to island.
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It is more difficult to determine the total amount of dark matter in an elliptical galaxy than in a spiral galaxy. Why?
A) Elliptical galaxies lack the atomic hydrogen gas that we use to determine orbital speeds at great distances from the centers of spiral galaxies. B) Elliptical galaxies contain much less dark matter than spiral galaxies, so it's much more difficult to measure. C) Stars in elliptical galaxies are dimmer, making them harder to study. D) cannot observe spectral lines for elliptical galaxies.
Generally speaking, the larger a nucleus is, the greater its
A) stability. B) instability. C) neither stability nor instability
Which is smallest?
A) a galaxy B) a local group C) a Supercluster D) the observable universe
It is desired to transport 4 m3/s of water through a rectangular finished concrete canal that can be at most 2 m wide. The slope of the land through which it passes is 0.0004. What depth of water should be expected?
(A) 1.01 m (B) 1.28 m (C) 1.44 m (D) 1.83 m