A resistor of unknown resistance and a 15-? resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
A. 75 ?
B. 12 ?
C. 7.5 ?
D. 30 ?
E. 5.0 ?
Answer: D
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If jovian moons harbor life, this life is likely to resemble what terrestrial organisms?
A) Bacteria B) Extremophiles C) Dolphins D) Moss E) Dinosaurs
Which best describes the surface of Callisto?
a. dark and dirty ice, heavily pocked with craters b. old and dark on some portion, but cratered with a young bright grooved terrain c. icy crust free of craters with a liquid water ocean beneath d. covered in active sulfur-based volcanoes e. mostly water ice mixed with methane
A block of Styrofoam floats on water while a same-size lead block lies submerged in the water. The buoyant force is greatest on the
A) lead. B) Styrofoam. C) same for both
The four fundamental forces in nature are the __________, __________, __________, and __________
Fill in the blank(s) with correct word