Which of the following statements about an ellipse is not true?
A) The semimajor axis of an ellipse is half the length of the longest line that you can draw across an ellipse.
B) An ellipse with a large eccentricity looks much more elongated (stretched out) than an ellipse with a small eccentricity.
C) A circle is considered to be a special type of ellipse.
D) The focus of an ellipse is always located precisely at the center of the ellipse.
D
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Which of the following statements about large-scale structure is probably not true?
A) Galaxies and clusters have grown around tiny density enhancements that were present in the early universe. B) Voids between superclusters began their existence as regions in the universe with a slightly lower density than the rest of the universe. C) Many cluster and superclusters are still in the process of formation as their gravity gradually pulls in new members. D) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall.
Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10-38 second after the Big Bang?
A) These two forces first became distinct at this time. B) These forces are important only at temperatures below the freezing point of water, which is a temperature that the universe reached at an age of about at 10-38 second. C) Freezing out was a term coined by particle physicists who think that the Big Bang theory is really cool. D) Following this time, neither the strong nor electroweak forces were ever important in the universe again.
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What will be an ideal response?
What are the important modes of heat transfer for a person sitting quietly in a room? What if the person is sitting near a roaring fireplace?
GIVEN - Person sitting quietly in a room - Person sitting in a room with a fireplace FIND (a) Modes of heat transfer for each situation ASSUMPTIONS - The person is clothed