How does Pluto's behavior at perihelion support its planetary status?
What will be an ideal response?
It develops a temporary atmosphere, much like a comet's coma.
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It took two centuries for the Copernican model to replaced the Ptolemaic model because
A) in Copernicus' time, there were no telescopes. B) the Church wouldn't let anyone talk about Copernicus' model for 200 years. C) there was no scientific evidence to support either model until Galileo made his observations. D) the Ptolemaic model was simpler and more aesthetically pleasing. E) the Copernican model required complicated new terms to explain it correctly.
When we add a displacement vector to another displacement vector, the result is:
a. a velocity. c. another displacement. b. an acceleration. d. a scalar.
Suppose you have a collection of pendullums of different lengths suspended on a string between two pegs as shown in this figure. Two of the pendulums have the same length and resonate with each other. If the mass of the bob of one of the two pendulums in resonance is doubled while the mass of the other remains the same, the two:
a. will still be in resonance. b. will no longer be in resonance. c. will resonate at twice the frequency. d. will resonate at a frequency that is not double.
Define the amplitude of a wave, and give an example