Venus and Earth started out with roughly the same amount of water. While Earth still has water in abundance, all of Venus' was lost. Where did it go?
A) It chemically combined with CO2 to form H2CO3.
B) Ultraviolet rays split the hydrogen from the oxygen components, and the hydrogen escaped into space.
C) It all evaporated into space due to the intense daytime heat of 470°C.
D) Scientists are still trying to determine this.
Answer: B
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Which forces have physicists shown to be the same force under conditions of very high temperature, as confirmed by experiments in particle accelerators?
A) the electromagnetic and weak forces B) gravity and the strong force C) the strong and electromagnetic forces D) the strong and weak forces E) gravity and the weak force
Entropy and temperature measure different properties of a sample of a substance, because temperature gauges average kinetic energy of molecules or atoms, but
A. entropy of an isolated system cannot decrease. B. entropy measures disorderliness or unruliness. C. low entropy substances cannot have a temperature. D. entropy is the inverse of temperature, due to conservation of momentum.
Explain the process that creates a nova
What will be an ideal response?
If the distance between two asteroids is doubled, the gravitational force they exert on each other will:
A) also be doubled. B) be half as great. C) be one fourth as great. D) be 1/16 as great. E) be four times greater.