Which igneous rock has light color (high silica content) and large grains (coarse texture)?
a. Gabbro
b. Granite
c. Rhyolite
d. Basalt
b
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What are the clouds of Uranus composed of?
a. hydrogen b. helium c. carbon dioxide d. methane e. sulfur
Potential: If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A. 2.3 × 107 m/s B. 1.9 × 107 m/s C. 1.5 × 107 m/s D. 1.1 × 107 m/s
How small are Hydrogen atoms?
A.) 10^-7 m. B.) 10^-8 m. C.) 10^-9 m. D.) 10^-10 m. E.) 10^-11 m.
In his model of the motions of the planets, Copernicus
A. assumed that the Earth is the center of the solar system. B. was able to make predictions that were much more accurate than Ptolemy's model. C. revived the idea that our solar system is heliocentric (Sun-centered). D. found that the planets move in paths shaped like ellipses.