Sunspots are dark because they are
A. slightly cooler regions, meaning they emit less light than the surrounding areas.
B. holes in the photosphere, allowing astronomers to view into the Sun's interior.
C. shadows from clouds in the Sun's atmosphere.
D. landmasses like continents on Earth.
Answer: A
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A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.00 s?
A. 9.80 m/s up B. zero C. 19.6 down D. 9.80 m/s down
Among discovered meteorites, we have found some with all the following origins except
A) being a fragment from the surface of Mars. B) being a fragment from the surface of the Moon. C) being a fragment from Comet Halley. D) being a fragment of a shattered asteroid.
Tides are influenced by
a. the moon b. the sun c. the uneven surface of the earth d. all of the above e. none of the above
Two charges of equal magnitude but opposite sign are 10 cm apart. The potential is largest
A. close to the positive charge. B. halfway between the two charges. C. close to the negative charge. D. far away from the two charges.