What happens to the core of a star after a planetary nebula occurs?
A) It contracts from a protostar to a main-sequence star.
B) It breaks apart in a violent explosion.
C) It becomes a white dwarf.
D) It becomes a neutron star.
E) none of the above
C
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What part of Earth's magnetic field is the first line of defense to solar wind particles?
a. radiation belts b. bow shock c. magnetosphere d. Van Allen belts e. magnetic poles
A resistor R is connected across a battery of negligible internal resistance. If the resistance of R is doubled, the current in R will be ________.
Fill in the blank(s) with the appropriate word(s).
Our Sun is a first-generation star.
a. true b. false
You stand by the railroad tracks as a train passes by. You hear a 950-Hz frequency when the train approaches, which changes to 820 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s
a. 14.0 m/s c. 25.0 m/s b. 20.0 m/s d. 37.8 m/s