As the temperature of the air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)
A) It increases.
B) It decreases.
C) It does not change.
D) It increases when atmospheric pressure is high and decreases when the pressure is low.
A
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Four of the five answers listed below are necessary characteristics to the life of an individual. Select the exception
a. energy use b. homeostasis c. development d. response to stimuli e. diversity
What two properties of Mercury imply that it is differentiated?
A) its size and magnetic field B) its large average density and its surface features C) its surface features and its size D) its large average density and its magnetic field E) its magnetic field and its surface features
Harlow Shapley found the Milky Way was:
A) centered on the Earth. B) much smaller than previously thought. C) rapidly expanding. D) much larger than previously thought. E) uniformly spherical in shape.
When we see a meteor shower, it means that
A) the solar wind is unusually strong. B) an Earth-approaching asteroid has recently come very close to our planet. C) you should duck and run for cover to avoid being blasted on the head by a rock from space. D) Earth is crossing the orbit of a comet.