I believe that the context is if you help you always get something in return
Answer:
Why are mountains the best?
Mountains are prime locations for tapping solar and wind energy. High elevation makes it easier to harvest more solar power, and the topography of valleys and mountains makes for powerful wind corridors. 9. They're formed by movement of the earth's crust.
Is mountains a nature?
"a natural elevation of the earth surface rising more or less abruptly from the surrounding level and attaining an altitude which, relatively to the adjacent elevation, is impressive or notable." Whether a landform is called a mountain may depend on local usage.
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the best sentence is choice A
The impedance of transformer coil that has 600 feet is 10+j 22.62 Ω (ohms)
Explanation:
It is given that
a #22 copper wire has resistance= R= 10 Ω
inductance= I=0.06 H
N=60 HZ
X= 2π * N * I
=2 * 3.14 * 60 *0.06
X=22.62 Ω
Impedance is calculated by
Z = R + j * X
=10+ j (22.62 Ω)
Z= 10+ j 22.62 Ω
The impedance of a transformer coil that has 600 feet is Z= 10+ j 22.62 Ω
