Suppose that several projectiles are fired upward. Which one will be in the air longest? (R is range, h is highest elevation, and t is time of flight.)
A) The one with the farthest range, R
B) The one with the highest maximum elevation, h
C) The one for which the product of (R)(t)(h) is maximum
D) The one with the greatest initial velocity
E) The one with the minimum elevation, h
B
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Cepheid variables are useful in measuring the distance to ____
a. globular clusters and dwarf galaxies around the Milky way, but nothing farther b. globular clusters and the Andromeda Galaxy, but not more distant objects c. galaxies that are within 30 megaparsecs, a relatively short distance d. galaxies that are moderately far away, up to about 500 megaparsecs e. galaxies and galactic clusters within a gigaparsec of the Milky Way
Habitability generally refers to an environment capable of sustaining
A) human life B) plant life C) microbial life only D) any kind of life
The atomic mass unit is based on the mass of the ________ atom.
What will be an ideal response?
A common property of all waves is the relationship between the speed (v), the wavelength (?), and the frequency of the wave (f). The correct equation for this relationship is which of the following?
A. v = f/? B. v = f? C. ? = vf D. f = v?