Eight little spheres of mercury coalesce to form a single sphere. Compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is
A) less.
B) the same.
C) greater.
Answer: A
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Which of the following is TRUE?
a) It is possible for galaxies that are very distant to actually move through space ata speed several times the speed of light. b) A redshift occurs when a photon loses energy and slows down as itmoves through space. c) We see distant galaxies as they were billions or even tens of billions ofyears ago. d) We measure a redshift for roughly half of the galaxies that we observe, and for theothers we measure a blueshift. e) The center of the universe is located at a point about 200 Mpc from us in the centerof a cluster of galaxies.
A radio galaxy whose lobes are swept back as if forming a tail. This probably indicates that:
A) this is evidence for intergalactic matter. B) the galaxy is about to evolve into a spiral. C) the galaxy is isolated, not part of a cluster. D) the galaxy is moving towards Earth. E) there must be another galaxy nearby.
Which of the following statements is an explanation, not an observation?
A) Stars can shine brightly for millions of years. B) Stars shine with energy generated by nuclear fusion in their cores. C) More distant galaxies are moving away from us faster than nearby galaxies. D) All planets orbit the Sun in the same direction and in nearly the same plane.
What determines a fluid's resistance to objects moving through it (such as water's resistance to fish moving through water, or air resistance to hailstones)?
a. The fluid's weight. b. The fluid's volume. c. The fluid's viscosity. d. The fluid's mass. e. The fluid's temperature.