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So the water can only follow one path... through the turbines; and if the generators aren't producing electricity, and removing kinetic energy from the water, the water moves too fast and causes erosion from cavitation. Is that right?

Why not have a diesel backup generator? This is starting to sound a little Fukushima...

... then get it's rego and then track the pilot What does this mean? What's a "rego"? Edit: Ah. http://www.regosearch.com/ I can't see how identifying the plane would lead to a knowing who the pilot is on a particular airline flight. Surely that's not a part of the info you get through...

How could you go from identifying the plane to finding the pilot's name/address?

And how old is the blast furnace? http://donwagner.dk/KoreanFe/KoreanFe.html In China actual blast furnaces and fineries have been excavated from as early as the first century B.C. (e.g. Gongxian 1962; Zhao Qingyun et al. 1985; WW 1978.2: 28ff), but these are the earliest iron-production...

Is a line of sight of 72 miles on a sphere earth credible? How high would an airplane have to be to see it at 72 nautical miles? The Metabunk Calculator uses statute miles so let's convert 72 nautical miles to statute miles...

To sum up: The 72 nautical miles is a technical specification for that particular unit. How strong it is. It doesn't mean it can always see 72 miles. That depends on if anything gets in the way. So mount your radar up high; which everyone always does. Think of an old fashioned lookout...

Something we haven't mentioned that might be a part of the OP's puzzlement is parallax. Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines...

Be sure you understand the idea of "specular reflection." The difference between matte black and gloss black is something that puzzles people... to the point that I've heard it in a stand-up comedian's routine. Both from Wikipedia: Reflection of light is either specular (mirror-like) or...

Dr. Joseph Shaw is the go-to expert on glitter patterns. https://www.esrl.noaa.gov/psd/outreach/education/science/glitter/ The name "glitter pattern" implies a moving and changing phenomenon. Glitter patterns consist of many bright points of light that come and go, blending together to form a...

Are you asking why the film format is called 135? As far as I can remember the 135 designation was specific to a Kodak product: a 35mm still camera film that came in its own cassette; introduced sometime in the '30's, I think. Before that photographers had to use a bulk film loader to load it...

Oops. zoom range factor

I posted this in a previous thread: I think that most of the scintillation in this video is caused by the photographer's breath. He was shooting through a window and his breath was hitting the glass. Look particularly at 4:20 when he makes an exclamation. The image dances at exactly the same...

Notes on the zoom lenses on these little digital cameras: - The "X" proudly written on the lens does not denote magnification power as it would with a telescope. It denotes the zoom factor range, which is the difference between the minimum focal length and the maximum focal length. The P900...

Before we do the work of answering your questions, I think it's reasonable for you to do the work of educating yourself in the basic issues involved. I think you should be able to answer these questions in your own words. 1. What is kinetic energy? 2. What is heat? 3. What is the difference...

Screwed, Blewed and Tattooed. What does it mean and where did it come from? The above, I think, could be the original spelling; which should give us the first clue that the meaning of the expression has changed over the years. Now it's Screwed, Blued and Tattooed. From...

Over the years I've been trying to boil down this type of thought to its basic elements. Simplify, exaggerate, choose a single devil, invent facts, universalize, be aggressive, mob. 1. Simplify an issue to the point it becomes a simple cartoon. 2. Exaggerate certain details until the cartoon...

To help people who aren't too familiar with the terms we've been using here, this old Air Force instructional film is the best thing I've found. The celestial equator is defined at 4:18 for instance, but I think you should start at the beginning. The great circle perpendicular to the axis is...

Thanks for the post. In the case of the single observer watching the moon seemingly rotate during the night, this effect has a name: field rotation. Everything in the sky "rotates" during the night. It might be easier to visualize a constellation like Orion rather than the moon. In the...

Venus is an inferior planet, so it goes through phases like the moon. Use ordinary binoculars and if it is Venus you will notice it looks like a gibbous moon. https://www.skymarvels.com/infopages/vids/Venus - Current 001.htm Venus is so bright it's actually better to look at it with some...