According to the passage, which gas is generated in especially large amounts when we burn fossil fuels?
A. carbon dioxide
B. methane
C. carbon monoxide
D. sulfur dioxide
Answer: A. carbon dioxide
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According to general relativity, why does the Earth orbit the Sun?
A) The Sun causes spacetime to curve, and Earth follows the straightest path through that curved spacetime. B) The Earth feels a force directed toward the Sun that pulls it inward. C) The universe has a spherical geometry, causing all objects within it to take closed orbits. D) The Earth only appears to be moving in an orbit because of length contraction and time dilation.
When red and blue light pass through a prism which one bends more?
A. Depends on the material the prism is made of. B. There is no way to predict this. C. Red light D. Blue light
Why are galaxy collisions of interest?
A. Collisions are extremely rare. B. Collisions and mergers play an important role in shaping galaxies. C. Collisions generate hundreds of black holes. D. Collisions have a strong effect on the evolution of stars.
A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water?
a. 5.7 m/s b. 8.5 m/s c. 8.1 m/s d. 7.0 m/s e. 6.4 m/s