In materials like glass or water, the speed of light is ________.
A. increased
B. reduced
C. the same as in a vacuum
D. sometimes reduced and sometimes increased
Answer: B
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Roughly how far across is the Milky Way?
A. 10 million light-years B. 25,000 light-years C. 25 light-years D. 100,000 light-years
Why can longitudinal earthquake waves go straight through the center of the Earth but transverse waves cannot?
What will be an ideal response?
How do the size and mass of Jupiter's core compare to the size and mass of Earth?
A) It is the same size and mass. B) It is about 10 times larger in size and the same mass. C) It is about the same size but is 10 times more massive. D) It is about 10 times larger both in size and mass. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m b. 15.8 m c. 13.5 m d. 11.0 m e. 4.9 m