Meandering streams are common in
A) V-shaped valleys.
B) natural levees.
C) flat floodplain areas.
D) areas of accumulation.
Answer: C
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How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring the masses and spectral types of main-sequence stars in binary systems B) by using computer models of hydrogen fusion and stellar structure C) by measuring stellar radii with powerful telescopes D) by comparing stars with the same spectral type but different luminosities
The downslope movement of soil and rock under the influence of gravity is known, in general, as ______________
Fill in the blank(s) with correct word
When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?
a. 7.2 W b. 7.6 W c. 6.9 W d. 8.0 W e. 2.8 W
A charged particle with mass m is suspended in the air by an upward-directed electric field E. What is the charge on the dust particle?
a. q = mgE b. q = mg/E c. q = E/mg d. q = Em/g