robert7248
15.07.2019 •
Physics
In a lightning dischage, 30c of charge moves through a potential difference 108v in 20mins. what is the current of the lightning bolt?
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Ответ:
30C/20min = 30C/1200sec
= 0.025 C/sec
= 0.025 Ampere of current.
I can't imagine where you got this question, and I'd very much like to know.
It says it's describing a lightning bolt, but it's got the current about a million times too small, and the time at least a million times too long. Also, the voltage doesn't matter, but it's also in the neighborhood of a million times too small for lightning. It's actually more like 108 volts FOR EVERY FOOT OF DISTANCE between the cloud and the ground.
Ответ:
During the equinox, which happens in spring and fall, the earth tilts to give the equator the most direct sun. During the winter solstice, the Southern Hemisphere is tilted most toward the sun. The closer we get to Dec. 21, the shorter the days will get, but after that, the days will gradually get longer again.
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