A bird, accelerating from rest at a constant rate, experiences a displacement of 25 m in 12 s. What is its acceleration?
a. 0.18 m/s2
b. 0.35 m/s2
c. 0.44 m/s2
d. 0.26 m/s2
e. 0.53 m/s2
b
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The Jovian problem refers to
a. the high speed with which the Jovian planets rotate on their axes. b. the large number of satellites that orbit each Jovian planet. c. the existence of rings around the Jovian planets. d. the excess heat radiated by the larger of the Jovian planets. e. the apparently short period of time that disks exist around stars from which Jovian planets can form.
Which of the following is NOT a kind of geological feature found on the Moon?
A. rille B. scarp C. crater D. maria
Astronomers believe that dark matter exists because
A. the galaxies in clusters move slower than expected on the basis of the material visible in them. B. it is the only way to explain the black holes in active galaxies. C. the outer parts of galaxies rotate faster than expected on the basis of the material visible in them. D. they can detect it with radio telescopes. E. All of these choices are correct.
Substitute the correct prefix to the fun-word "1012-tory"
A) milli B) kilo C) giga D) pico E) tera