The tail of a comet always points ________.
A. toward the Sun
B. away from the Sun
C. backward
D. forward
Answer: B
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Homogeneity and isotropy, taken as assumptions regarding the structure and evolution of the universe, are known as
A) the cosmological principle. B) Hubble's law. C) Wien's law. D) the Grand Unified Theory. E) Olbers's paradox.
Which type of force would be the equal and opposite force to a gravitational force?
a. gravitational b. electromagnetic c. strong d. weak e. It could be any one of the above or some combination of them.
What type of reaction gives CO2 and H2O as the only products?
a. Complete hydrocarbon combustion b. Acid–base reaction c. Acid–carbonate reaction d. Single-replacement, with an acid and an active metal
In an inelastic collision involving an isolated system, the final total momentum is
A) exactly the same as the initial momentum. B) more than the initial momentum. C) less than the initial momentum.