To what three types of modern survivors can the masses of the protogalactic blobs be compared?
What will be an ideal response?
Globular clusters, dwarf irregular galaxies, and dwarf elliptical galaxies are all about 1-10 million solar masses.
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What is the correct order of densities from least to most?
a. supergiant, main sequence, white dwarf b. main sequence, white dwarf, supergiant c. white dwarf, main sequence, giant d. main sequence, giant, supergiant
Which of the following types of interference will occur when the pulses in the figure above meet?
a. no interference b. constructive interference c. destructive interference d. total interference
When 1.0 gram of hydrogen combines with 8.0 grams of oxygen, 9.0 grams of water is formed. But is this true? During the reaction 2.86 × 105 J of energy is released. How much mass is actually lost in this reaction?
What will be an ideal response?
You are standing on a platform and a train approaches you, moving at a constant velocity. Its whistle is blowing continuously. The train does not stop at the platform, but it continues to move past the platform at a constant velocity. Which of the following statements are true about the frequency of the train's whistle that you hear?
1.The whistle's frequency that you hear increases continually as the train approaches the platform and then decreases continually after the train passes the platform. 2.The whistle's frequency that you hear seems to you to remain constant for the entire duration of the train's passage. 3.The whistle's frequency that you hear decreases continually as the train approaches the platform and then increases continually after the train passes the platform. 4.The whistle's frequency that you hear remains constant as the train approaches the platform and then decreases immediately after the train passes the platform, after which it remains constant at a lower pitch than it had originally.