Which of the following is not a line of evidence supporting the hypothesis that our Moon formed as a result of a giant impact?
A) The Pacific Ocean appears to be a large crater, probably the one made by the giant impact.
B) Computer simulations show that the Moon could really have formed through a giant impact.
C) The Moon's average density suggests it is made of rock much more like that of the Earth's outer layers than that of the Earth as a whole.
D) The Moon has a much smaller proportion of easily vaporized materials than Earth.
A) The Pacific Ocean appears to be a large crater, probably the one made by the giant impact.
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If the distance between two asteroids is doubled, the gravitational force they exert on each other will
A) be 1/16 as great. B) be one-half as great. C) also be doubled. D) be four times greater. E) be one-fourth as great.
The main point of Newton's law of motion is that forces cause
A) velocity. B) energy. C) acceleration. D) All of the above. E) None of the above.
An electron inside a hydrogen atom is confined to within a space of about 0.12 nm
What is the uncertainty in this electron's speed? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 3.1 × 105 m/s B) 3.1 km/s C) 4.8 × 106 m/s D) 4.8 m/s E) 9.6 × 105 m/s
The protective shells that many sea organisms grow are not minerals because they
A) are not calcium carbonate. B) are organic. C) are made of ooze. D) become compacted.