The Milky Way galaxy has a rotation curve that:
A. decreases rapidly with increasing radius in the disk, indicating the presence of dark matter.
B. stays constant out to large radii in the disk, indicating the presence of dark matter.
C. increases drastically with increasing radius.
D. decreases rapidly with increasing radius in the disk, indicating no dark matter is present.
E. stays constant out to large radii in the disk, indicating that no dark matter is present.
Ans: B. stays constant out to large radii in the disk, indicating the presence of dark matter.
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The basic function of a carburetor of an automobile is to atomize the gasoline and mix it with air to promote rapid combustion. As an example, assume that 30 cm3 of gasoline is atomized into N spherical droplets, each with a radius of 2.0 × 10^?5 m. What is the total surface area of these N spherical droplets?
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