The ratio of the final kinetic energy to the initial kinetic energy of an object is one half. If the initial velocity of the object is 10 m/s, what is the final velocity?
A) 20 m/s
B) 10 m/s
C) 7.1 m/s
D) 2.7 m/s
E) 1.5 m/s
C
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Waves arriving at a free boundary are
a. neither reflected nor inverted. b. reflected but not inverted. c. reflected and inverted. d. inverted but not reflected.
Galactic collisions are believed to be commonplace
Indicate whether the statement is true or false
All of the following are units used to describe radiation dosage in humans except
A) curie. B) rad. C) rem. D) RBE. E) sievert.
How might a nearby neighbor change the shape of this galaxy?
A. It might obliterate all life in that galaxy because of collisions between different planetary systems in the merger of the two galaxies. B. A merger with the neighbor might tighten the spiral arms and lead to a shrinking of the bulge component. C. It might make the disk of the galaxy thinner and the halo rounder. D. Small whirlpools might form in the disk of the spiral and the gas and stars would fall into them, leading to the disappearance of the disk. E. The merger of two spiral galaxies may give rise to an elliptical galaxy.