The velocity of a body is graphed as a function of time. The slope of the graph at any point may be identified with
A. instantaneous speed.
B. average velocity.
C. average acceleration.
D. instantaneous velocity.
E. instantaneous acceleration.
Answer: E
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The violent explosive death of an aging massive star results in a _____
A) planetary nebula B) white dwarf C) supernova D) spiral trace
The color of a star is a measure of its
A) surface temperature B) chemical composition C) mass D) size
Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond?
A) They have a wavelength of two cycles per second. B) They have a frequency of 4 hertz. C) We can calculate the wavelength of the ripples from their frequency. D) They have a frequency of 2 hertz.
Which of the following is a reason to build an observatory in space?
A. to avoid atmospheric blurring B. They are much less expensive than ground-based observatories. C. They can last forever. D. There is no good reason to build a space-based observatory.