What is Astronomy?
What will be an ideal response?
The scientific study of the objects that lie beyond our planet Earth and the processes by which these objects interact with one another.
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A particle moving along the x axis has a position given by x = 54t - 2.0t3 m. At the time t = 3.0 s, the speed of the particle is zero. Which statement is correct?
a. The particle remains at rest after t = 3.0 s. b. The particle no longer accelerates after t = 3.0 s. c. The particle can be found at positions x < 0 m only when t < 0 s. d. All of the above are correct. e. None of the above is correct.
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 1000 m from the source is (in dB)
A. 62.8. B. 66.0. C. 68.5. D. 70.5. E. 72.0.
Why are there two tails to some comets?
A. The "dust tail" is formed by solar radiation pressure. The "gas tail," is pushed out by the solar wind. B. The "gas tail" is formed by solar radiation pressure. The "dust tail," is pushed out by the solar wind. C. Comets contain dense material which is attracted by the Sun's gravity, forming a tail which points toward the Sun. D. The statement is false: comets have only one tail.
Two boundaries associated with seafloor spreading centers are
A) convergent boundaries and transform fault boundaries. B) divergent boundaries and transform fault boundaries. C) oceanic-oceanic boundaries and divergent boundaries. D) divergent boundaries and convergent boundaries.