If the objects seen in the past are galaxies, how might they have changed?
A. Galaxies would have had less star formation in the past than at present.
B. There were more ellipticals in the past and would be spirals at present.
C. Things would have had a larger mass in the past than at present.
D. They would have been destroyed by supernovae explosions by the present time.
E. The galaxies were more irregular and patchy in the past than they are at present.
Ans: E. The galaxies were more irregular and patchy in the past than they are at present.
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After the first solid grains formed in our solar system, these particles could then grow by the process of ____, the collision and sticking of one particle with another to continue the formation of planetesimals. Each of these has many atoms or molecules
a. Accretion b. Sublimation c. Hydration d. Condensation e. Vaporization
What normally occurs in a saucer of water placed on your table is
A) evaporation. B) condensation. C) both of these D) none of the above
A knight on horseback holds a 9.0-m lance. The horse can run at 0.75c. (It wins most of its races!) How long will the lance appear to a person that is standing still on the ground as the horse runs past?
a. 6.0 m b. 14 m c. 9 m d. 6.8 m e. 4.5 m
A certain automobile engine takes in 4.00 kJ of heat and performs 1.10 kJ of mechanical work in each cycle
(a) Calculate the engine's efficiency. (b) How much heat is "wasted" in each cycle?