A system of 12 electrons and 18 protons has a net charge of
a. 9.6 × 10^-19 C.
b. –9.6 × 10^-19 C.
c. 17.6 × 10^-19 C.
d. 6.0 × 10^-19 C.
e. –17.6 × 10^-19 C.
a
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A transformer is to be used to step down voltage from an alternating current source from 220 V to 110 V. If the primary has 120 turns, then the number of turns in the secondary is
A. 2. B. 720. C. 1320. D. 240. E. 60.
A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1. (Assume the room temperature is 70°F.)
A. 217 B. 180 C. 90 D. 68 E. 850
The infiltration of water is greatest in
A) calcite-cemented sandstone. B) sandy soil. C) clay soil. D) silica-cemented sandstone.
____ is a segment of a chromosome that controls a specific function
a. DNA b. RNA c. An enzyme d. A gene e. An amino acid