Star ________ have been vital in understanding stellar evolution, finding distances, and mapping the structure of our Galaxy
Fill in the blank(s) with correct word
clusters
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When did Copernicus live?
A) about 500 years ago B) about 1000 years ago C) about 2000 years ago D) about 100 years ago E) about 5000 years ago
The graph below shows the velocity versus time graph for a ball. Which explanation best fits the motion of the ball as shown by the graph?
a.
The ball is falling, is caught, and is thrown down with greater velocity.
b.
The ball is rolling, stops, and then continues rolling.
c.
The ball is rising, hits the ceiling, and falls down.
d.
The ball is falling, hits the floor, and bounces up.
e.
The ball is rising, is caught, and then is thrown down.
Which of the following are true statements about the extrasolar planets found so far?
A) Extrasolar planets have a much wider range of densities than the planets in the solar system. B) Extrasolar planets fall neatly into the terrestrial and jovian categories. C) Extrasolar planets all have nearly circular orbits. D) All of the above are correct.
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. How fast can she swim in still water?
A) 0.50 m/s B) 0.80 m/s C) 1.2 m/s D) 1.4 m/s E) 1.8 m/s