The GAIA mission obtains astrometric data of stars with accuracy in some cases better than 10 microarcseconds. In terms of angular width, what is this equal to?
A) A human hair viewed from a distance of 20 miles
B) A human hair viewed from a distance of 200 miles
C) A human hair viewed from a distance of 2000 miles
D) A human hair viewed from a distance of 20000 miles
C
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Process of Science: Why do scientists believe that black holes can't last forever, and do they have any observational evidence to support this idea?
What will be an ideal response?
A change in pressure at any point in a confined fluid at rest is transmitted
A) undiminished to all points in the fluid. B) to points of lower pressure. C) in the direction of lower energies. D) all of the above E) none of the above
How do we account for the great variety of substances in the world?
A) The Earth is 4.5 billion years old. B) Most of these substances are organic compounds. C) Atoms are incredibly small. D) There are many possible combinations of atoms.
One of the particle groups listed below includes two other groups on the list. Which group is it?
A) leptons B) hadrons C) mesons D) bosons. E) baryons