If two identical balls have momenta that are equal in magnitude but opposite in direction, what do we know about the speeds of the two balls after the two collide?
a. The speeds of the two balls will always be the same.
b. The speeds of the two balls will always be different.
c. The speeds with both will be faster than before.
d. The ball that was hit first will move faster.
e. The ball that was hit first will move more slowly.
a
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An ant crawls in a straight line at a constant speed of 0.24 m/s for a distance of 3.0 m, beginning in the corner of a square classroom. It then turns exactly 90 degrees to the right, and proceeds an additional 4.0 m with a constant speed of 0.44 m/s, reaching the other corner of the same wall from which it began. What was the average speed for the full trip from corner to corner?
A. 0.34 m/s B. 0.30 m/s C. 0.21 m/s D. 0.23 m/s E. 0.32 m/s
Which of the following statements about large-scale structure is probably not true?
A) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall. B) Galaxies and clusters have grown around tiny density enhancements that were present in the early universe. C) Voids between superclusters began their existence as regions in the universe with a slightly lower density than the rest of the universe. D) Many cluster and superclusters are still in the process of formation as their gravity gradually pulls in new members.
Which mysterious phenomena do scientists attribute to dark energy?
A: The increasing rate of expansion of the universe. B: Mysterious bonding that holds atoms together. C: The creation of the cosmic microwave background. D: The formation of Helium through nucleosynthesis. E: Dark energy causes ALL of the above.
What makes up the interstellar medium?
A) O and B stars B) open clusters C) K and M stars D) gas and dust E) all of the above