If we assume space to be infinite, what is the possibility of multiple universes where the laws of physics may be different than those of our universe?
Since we have not detected a limit to space we must treat it as theoretically infinite,
and since there are regions beyond the outer limits of our current observations we
should probably admit the possibility of regions where the laws of physics are
different. If such regions exist, however, it will be very difficult for us to understand
what goes on there since our explanations of what we observe in space relies heavily
on our belief that the principles of science that we see in action on and near our
Earth, must also hold true for other regions of space as well.
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The isotope 238U, which starts one of the natural radioactive series, decays first by alpha decay followed by two negative beta decays. At this point, what is the resulting isotope?
a. 238U b. 236U c. 234Th (Z = 90 for Th.) d. Some other uranium isotope not given above.
Work is defined as force times
a. distance. b. time. c. parallel distance. d. perpendicular distance.
The most striking example of solar variability was:
A) the Dust Bowl drought of the 1930s. B) the Maunder Minimum from 1645-1715. C) the Sporer Minimum that doomed the Anasazi. D) the fall of Rome. E) Joseph's seven lean years in the Old Testament.
An object is pulled with three forces: one at 20 N to the right, another at 40 N to the right, and the third at 30 N to the left. The net force is
A) 60 N to the right. B) 60 N to the left. C) 30 N to the left. D) none of the above