A certain piece of land can support up to 100 cattle. If the number of cattle doubles every 3 years, how many years will it take for the original cattle population of 25 to reach the land's carrying capacity?
a. 3
b. 6
c. 9
d. 12
e. 15
B
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What will be an ideal response?
Some stars vary in brightness. What observing technique is best for observing the details of the changes in brightness?
A) Time-monitoring because we want to track how the brightness changes with time. B) Imaging because an image will show the star getting brighter and dimmer. C) Spectroscopy because changing brightness means changing temperature. D) All of the above are equally useful in detecting variation in brightness.
A child is riding a merry-go-round which completes one revolution every 8.36 s. The child is standing 4.65 m from the center of the merry-go-round. What is the magnitude of the centripetal acceleration of the child?
A) 6.84 m/s2 B) 3.94 m/s2 C) 2.63 m/s2 D) 0.0664 m/s2 E) 0.696 m/s2
For a bullet fired horizontally, its ________ velocity will retain a constant non-zero value until it is stopped.
Fill in the blank(s) with the appropriate word(s).