The best places for life to have formed on Earth are believed to have been
a. near the south pole on the ice.
b. on the continent of Africa in the areas with no water.
c. in liquid water, probably in the oceans or pools of water.
C
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Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r
Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit? A) 20 days B) 40 days C) 80 days D) 160 days E) 320 days
A 2.0-kg object moving 5.0 m/s collides with and sticks to an 8.0-kg object initially at rest. Determine the kinetic energy lost by the system as a result of this collision
a. 20 J b. 15 J c. 30 J d. 25 J e. 5.0 J
Cosmic inflation caused the universe to expand, for a brief period, at faster than lightspeed. But special relativity says that nothing can move faster than lightspeed. How can this contradiction be resolved?
A) The laws of physics (conservation of energy, special relativity, etc.) as we presently know them were not valid during the "inflationary period" that existed for a fraction of a second into the big bang. B) We now realize that special relativity does not apply to dark energy. C) Special relativity says nothing can move through space at faster than lightspeed, but doesn't restrict the speed at which space can expand. D) It hasn't yet been resolved, but scientists are working on resolving it. E) The laws of specially relativity were not valid during the inflationary period, but the other laws (such as conservation of energy) were valid.