What is a "planetary nebula"?
A. It is what is left when a white dwarf star explodes as a supernova.
B. It is a shell of gas ejected from a star late in its life.
C. It is the cloud from which protostars form.
D. It is the disk of gas around a young star.
Answer: B
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What is the maximum velocity of the simple harmonic motion?
A. 41.0 cm/s B. 32.8 cm/s C. 24.5 cm/s D. 20.5 cm/s E. 12.8 cm/s
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Indicate whether the statement is true or false
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